Netfabb basic documentation

netfabb Basic 5.2
User Manual
Copyright by netfabb GmbH 2014
support@netfabb.com
Version: July 29, 2014
This document shall not be distributed without the permission of netfabb GmbH.

CONTENTS 1
Contents
1 STL Files and Triangle Meshes 6
1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Closedness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Orientability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.4 Self-Intersections . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 Program Overview 12
2.1 The Project Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2 The Viewing Screen . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3 Program Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.4 The Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.5 File Format Overview (partially Private/Pro feature) . . . . . . . . . 21
2.6 All Shortkeys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3 Project Management 25
3.1 Start Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.2 Open Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.2.1 Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.2.2 Add Part . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.2.3 File Preview Browser . . . . . . . . . . . . . . . . . . . . . 30
3.2.4 Split STL Files (Private/Pro feature) . . . . . . . . . . . . . 32
3.2.5 Create Report (Pro feature) . . . . . . . . . . . . . . . . . . 33
3.2.6 Professional Tool: CAD Import (only available with Pro) . . 35
3.3 Save and Export . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.3.1 Save . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.3.2 Export Project to STL (Private/Pro feature) . . . . . . . . . 36

CONTENTS 2
3.3.3 Export Part . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.4 Prints and Screenshots . . . . . . . . . . . . . . . . . . . . . . . . 40
4 Viewing Options 42
4.1 Perspectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.2 Centering and Zooming . . . . . . . . . . . . . . . . . . . . . . . . 45
4.3 Displaying Options . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.4 Mesh viewer - Show color and texture (Private/Pro feature) . . . . . 51
5 Part Management 53
5.1 Add and Remove Parts . . . . . . . . . . . . . . . . . . . . . . . . 53
5.2 Select Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5.2.1 Advanced Part Selection (Private/Pro feature) . . . . . . . . 55
5.3 Standard models - the part library (partially Private/Pro feature) . . . 58
5.4 Duplicate Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
5.5 Position and Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.5.1 Move Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.5.2 Rotate Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.5.3 Align Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.5.4 Scale Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 68
5.5.5 Arrange Parts (partially Pro feature) . . . . . . . . . . . . . 69
5.6 Professional Tool: Automatic Packing (only available with Pro) . . . 70
5.6.1 Small . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
5.6.2 Medium and Large . . . . . . . . . . . . . . . . . . . . . . 73
5.7 Part Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
5.8 Platform Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 77
5.9 New platform (Pro feature) . . . . . . . . . . . . . . . . . . . . . . 78
5.10 Collision Detection . . . . . . . . . . . . . . . . . . . . . . . . . . 79
5.10.1 Live Collision Detection (Pro feature) . . . . . . . . . . . . 80
6 Part Edit 82
6.1 Part Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6.1.1 Standard Analysis . . . . . . . . . . . . . . . . . . . . . . 84
6.1.2 Upskin and Downskin Analysis (Pro feature) . . . . . . . . 84
6.1.3 Center of gravity (Pro feature) . . . . . . . . . . . . . . . . 85

CONTENTS 3
6.1.4 Wall thickness (Pro feature) . . . . . . . . . . . . . . . . . 86
6.1.5 Shadow Area Analysis (Pro feature) . . . . . . . . . . . . . 87
6.2 Simple Part Editing . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.2.1 Invert Part . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
6.2.2 Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
6.2.3 Convert Units . . . . . . . . . . . . . . . . . . . . . . . . . 89
6.2.4 Shells to Parts (Private/Pro feature . . . . . . . . . . . . . . 90
6.2.5 Merge Parts (Private/Pro feature) . . . . . . . . . . . . . . . 90
6.3 Create Shell (Private/Pro feature) . . . . . . . . . . . . . . . . . . . 90
6.4 Simple Cutting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
6.5 Free Cut Private/Pro feature . . . . . . . . . . . . . . . . . . . . . . 97
6.5.1 Free Cut with a Cutting Plane . . . . . . . . . . . . . . . . 97
6.5.2 Free Cut with a Polygon . . . . . . . . . . . . . . . . . . . 103
6.5.3 Cutting Options . . . . . . . . . . . . . . . . . . . . . . . . 107
6.6 Boolean Operations (Private/Pro feature) . . . . . . . . . . . . . . . 109
6.7 Labeling (Private/Pro feature) . . . . . . . . . . . . . . . . . . . . . 112
6.8 Triangle Reduction (Private/Pro feature) . . . . . . . . . . . . . . . 116
6.9 Mesh Smoothing (Private/Pro feature) . . . . . . . . . . . . . . . . 117
6.10 Remesh (Private/Pro feature) . . . . . . . . . . . . . . . . . . . . . 119
6.11 Compare two meshes (Private/Pro feature) . . . . . . . . . . . . . . 120
6.12 Windows
R Kinect
R - scan to netfabb . . . . . . . . . . . . . . . . 125
6.13 Texture and color mesh (Private/Pro feature) . . . . . . . . . . . . . 126
6.13.1 Coloring . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
6.13.2 Texturing . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
6.13.3 Add advanced texture (Pro feature) . . . . . . . . . . . . . 130
7 Part Repair (partially Private/Pro feature) 134
7.1 The Repair Module . . . . . . . . . . . . . . . . . . . . . . . . . . 134
7.2 Repair Viewing Options . . . . . . . . . . . . . . . . . . . . . . . . 136
7.2.1 Zoom and visualization . . . . . . . . . . . . . . . . . . . . 137
7.2.2 Inner view (Private/Pro feature) . . . . . . . . . . . . . . . 137
7.3 Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
7.4 Manual Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
7.5 Semi-Automatic Repair . . . . . . . . . . . . . . . . . . . . . . . . 147

CONTENTS 4
7.5.1 Close Holes . . . . . . . . . . . . . . . . . . . . . . . . . . 147
7.5.2 Self-Intersections . . . . . . . . . . . . . . . . . . . . . . . 147
7.5.3 Stitch Triangles . . . . . . . . . . . . . . . . . . . . . . . . 150
7.5.4 Fix Flipped Triangles . . . . . . . . . . . . . . . . . . . . . 151
7.5.5 Remove Double Triangles . . . . . . . . . . . . . . . . . . 152
7.5.6 Select Overlapping Triangles . . . . . . . . . . . . . . . . . 153
7.5.7 Remove Degenerate Faces . . . . . . . . . . . . . . . . . . 153
7.5.8 Extract Selected Triangles As Part . . . . . . . . . . . . . . 153
7.5.9 Split Non-Oriented Edges . . . . . . . . . . . . . . . . . . 154
7.5.10 Wrap part surface (Private/Pro feature) . . . . . . . . . . . 155
7.6 Automatic Repair (partially Private/Pro feature) . . . . . . . . . . . 156
7.7 Edit Triangle Mesh (Private/Pro feature) . . . . . . . . . . . . . . . 158
7.7.1 Refine Triangle Mesh (Private/Pro feature) . . . . . . . . . 158
7.7.2 Reduce Triangles (Private/Pro feature) . . . . . . . . . . . . 159
7.7.3 Z-Compensation (Pro feature) . . . . . . . . . . . . . . . . 160
7.7.4 Smooth Triangles (Private/Pro feature) . . . . . . . . . . . . 161
7.7.5 Cut Surfaces (Private/Pro feature) . . . . . . . . . . . . . . 162
7.7.6 Offset Hole Edges (Private/Pro feature) . . . . . . . . . . . 165
7.7.7 Extrude Surfaces (Private/Pro feature) . . . . . . . . . . . . 166
7.7.8 3D-Extrude (Private/Pro feature) . . . . . . . . . . . . . . . 170
8 Measuring and Quality Assurance 172
8.1 The Measuring Tool . . . . . . . . . . . . . . . . . . . . . . . . . . 172
8.1.1 Cutting Lines . . . . . . . . . . . . . . . . . . . . . . . . . 175
8.1.2 Setting Anchors . . . . . . . . . . . . . . . . . . . . . . . . 175
8.1.3 Measure Distance . . . . . . . . . . . . . . . . . . . . . . . 177
8.1.4 Measure Angles . . . . . . . . . . . . . . . . . . . . . . . 179
8.1.5 Measure Radius . . . . . . . . . . . . . . . . . . . . . . . . 180
8.1.6 Add Note . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
8.1.7 Set Default Modes . . . . . . . . . . . . . . . . . . . . . . 182
8.1.8 Lock and Unlock View . . . . . . . . . . . . . . . . . . . . 183
8.2 Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
8.2.1 Create Definition . . . . . . . . . . . . . . . . . . . . . . . 184
8.2.2 Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

CONTENTS 5
8.2.3 Test Result . . . . . . . . . . . . . . . . . . . . . . . . . . 186
9 The Slice Commander (partially Pro feature) 188
9.1 The Slicing Process . . . . . . . . . . . . . . . . . . . . . . . . . . 188
9.2 The Slices Section . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
9.3 Active Slice File . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
9.4 Slice Selection and Handling . . . . . . . . . . . . . . . . . . . . . 192
9.4.1 Select Slices . . . . . . . . . . . . . . . . . . . . . . . . . 192
9.4.2 Slice Viewing Options . . . . . . . . . . . . . . . . . . . . 192
9.4.3 Move, Rotate, Scale and Mirror Slices . . . . . . . . . . . . 194
9.4.4 Merging and Grouping . . . . . . . . . . . . . . . . . . . . 197
9.5 Edit Slices (Pro feature) . . . . . . . . . . . . . . . . . . . . . . . . 198
9.5.1 Boolean Operations & Removing Self-Intersections . . . . . 198
9.5.2 Create Offsets of Slices . . . . . . . . . . . . . . . . . . . . 200
9.5.3 Point Reduction . . . . . . . . . . . . . . . . . . . . . . . . 203
9.6 Edit Filling (Pro feature) . . . . . . . . . . . . . . . . . . . . . . . 204
9.6.1 Create Filling . . . . . . . . . . . . . . . . . . . . . . . . . 204
9.6.2 Hatch cutting . . . . . . . . . . . . . . . . . . . . . . . . . 207
9.6.3 Convert contours/hatches . . . . . . . . . . . . . . . . . . . 208
9.7 Export and Save Slices . . . . . . . . . . . . . . . . . . . . . . . . 209
10 Settings 220
10.1 General Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
10.2 Change Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
10.3 Edit File Associations . . . . . . . . . . . . . . . . . . . . . . . . . 230
Index 232

6
Chapter 1
STL Files and Triangle Meshes
The STL-format is the industrial standard for handling triangulated meshes. STL-files
contain a plain list of three-dimensional corner point coordinates and flat trian-gles.
The triangles, also referred to as faces, are defined by three corner points and
have an inside and an outside. Adjacent triangles may use common corner points
and share the same edges, which results in a coherent triangle mesh (figure 1.1).
The generality and simplicity of this concept makes STL-files compatible to a lot of
applications.
Figure 1.1: Parametric Surface and Triangulated Representation
However, they do not contain any topological information about the mesh. This
causes typical errors when CAD files with different file formats are converted to
STL. The netfabb software is a specialized software to detect and repair these kinds
of damages and create faultless meshes without holes, deformations or intersections.

VALIDITY 7
These meshes can then be converted into slice files ready for additive manufacturing.
The STL format aims for a precise approximation of bodies in three-dimensional
space. Although other CAD formats have advantages in that respect, a variety of
applications need a surface representation consisting of flat triangles. These are:
- Accelerated rendering in multimedia applications
- Solving partial differential equations
- Computer aided engineering
- Rapid prototyping and additive manufacturing
However, a simple collection of triangles will not always create a solid body. For a
good triangle mesh that can be used for 3D printing, the mesh has to be valid, closed,
oriented and should not contain any self-intersections.
1.1 Validity
Two edges of adjacent triangles which lie on top of each other are only regarded as
one edge, if they have equal end points. Thus, the simple mesh in figure 1.2 consists
of two triangles and has exactly five edges: four border edges and one interior edge.
Border edges belong to only one triangle, while interior edges connect two triangles.
Figure 1.2: A simple mesh with 5 edges: four border edges and one interior edge.
A mesh is only regarded as valid, if interior edges have the same corner points for
both adjacent triangles. Only then, all neighboring triangles are connected by a whole

CLOSEDNESS 8
interior edge (figure 1.3, 1.4). No neighbouring triangles are split and a smooth
topology is created.
This validity is an essential property of most calculations. If two edges have only
one common corner point, they will be defined as two border edges, even if they are
on top of each other.
Figure 1.3: An invalid triangulation (left) compared to a valid triangulation (right).
Figure 1.4: Two meshes, one valid and one arbitrary chaotic.
1.2 Closedness
Parts can only be used for 3D printing, if their surface is closed. This means that
there are no holes and no border edges. Every edge has to be attached to exactly two
triangles and all neighbouring triangles have to share an interior edge (figure 1.5, 1.6).
Closedness may separate a mesh into several components called shells (figure 1.7).

ORIENTABILITY 9
Figure 1.5: A closed surface (left) and a surface with holes (right)
Figure 1.6: Two disconnected (left) and two connected triangles (right)
1.3 Orientability
For the conversion of triangle meshes into slice data ready for 3D printing, it is vital
that the parts are oriented correctly. The orientation defines the outside and the inside
of a part.
The orientation of a part is determined by the orientation of all triangles. The order
of the points defining a triangle defines its orientation by the "right-hand-rule" (fig-ure
1.8). If the orientations of all neighbouring triangles conform to each other and
there are no flipped triangles, a closed shell separates between outside and inside.
But if there are flipped triangles, this may not be possible. Thus, even closed parts
may be faulty.

SELF-INTERSECTIONS 10
Figure 1.7: A mesh consisting of 60 disjoint shells.
Figure 1.8: The orientation of a triangle is determined by the order of its points.
1.4 Self-Intersections
Finally, the surface of a solid body should not contain any self-intersections. These
occur whenever triangles or surfaces of one part cut through each other (fig-ure
1.9, 1.10). For many applications, self-intersections are very impractical, es-pecially
if the mesh shall be processed further.
For most additive fabrication processes, three-dimensional data has to be converted
into two-and-a-half-dimensional slice data. Here, self-intersections in the original

SELF-INTERSECTIONS 11
Figure 1.9: Self-Intersection: The two cubic shells cut through each other
Figure 1.10: Left: A mesh consisting of two shells with self-intersection. Right:A
mesh consisting of one, non-intersecting shell.
data result in self-intersection in the slices. These might cause constructional fail-ures
or instabilities. Therefore, it is essential to remove self-intersections during the
preparation of files.

12
Chapter 2
Program Overview
netfabb is a software tailored for additive manufacturing, rapid prototyping and 3D
printing. It prepares three-dimensional files for printing and converts them into two-and-
a-half-dimensional slice files, consisting of a list of two-dimensional slice layers.
To help users prepare the print, it includes the features for viewing, editing, repairing
and analyzing three-dimensional STL-files or slice-based files in various formats.
All operations are conducted within projects, which can include any number of three-dimensional
parts or slice files. The modular design of the software allows the use of
different modules within a project, such as the repair module or the Slice Comman-der,
which are linked to other user interfaces. Still, they can be executed simultane-ously,
as the user can switch between modules without any loss of information.
The user interface of the program is divided into the viewing screen, the menu bar
and toolbar at the top and the context area to the right (figure 2.1). By clicking on the
bar between the viewing screen and the context area, the context area is hidden and
the bar is pushed to the right edge of the screen. Another click on the bar will bring
the context area back. By clicking on the edge of the bar and holding the mouse
button, you can move the edge further into the screen by drag & drop.
In the top half of the context area, all parts and slices are listed in the project tree.
The project tree can be used to get an overview over the project, organize files and to
perform certain functions.
Most of the netfabb window however is occupied by the viewing screen, which
visualizes the project and includes viewing options, positioning functions and a few
basic handling options.
For the control of the program, functions can be found in context menus, tabsheets,

13
the toolbar and the menu bar. Many of those functions can also be performed with
shortkeys on your keyboard.
In the bottom left corner, there is either a green or a red dot. When netfabb is con-nected
to the internet, it is green, otherwise it is red. An internet connection is nec-essary
for automatic updates and update notifications.
Figure 2.1: An overview of the netfabb interface
Menu bar Project tree
Tool bar Context area
Viewing screen Coordinate system
Platform Tabsheet
Current mode

THE PROJECT TREE 14
2.1 The Project Tree
The project tree lists all parts and slices of a project in a way similar to a direc-tory
tree. There are several sections, such as "Parts" and "Slices". The elements in
the project tree can be sorted into groups, and they can have subordinate elements,
such as a part repair or the measuring of a part. These are often connected to other
modules.
Subordinate elements of groups or parts are shown and hidden, if you click on the
little Plus or Minus on the left side of the part (figure 2.2).
Figure 2.2: This project tree includes a group with the two parts "Pyramid" and
"House". The grey eye indicates that the pyramid is hidden. The warning sign for
the house indicates that it is damaged. A repair has been opened. For the part
"Flower", a measuring of a distance and a diameter has been performed and an
analysis has been conducted. The little box next to the part "Spider" indicates that
the part consists of more than one shell. The parts "Pyramid" and "Flower" have
already been sliced.
During work with netfabb, you can always switch between the different sections,
elements and operations of the project by simply left-clicking on them in the tree.
If you click on a sliced part in the slices section, netfabb will automatically switch
to the Slice Commander and select the part you clicked on. If you click on a part
repair, netfabb will automatically switch to the repair module of the superordinate
part, including all previously conducted repair operations. That way you can conduct

THE PROJECT TREE 15
different operations at the same time, switching between them in the process.
Next to the part name, there is a percentage value. This value specifies the level of
detail (see chapter 4.3) with which the parts are displayed in the screen.
By clicking on parts or slices, these are selected and can be worked with. If a part
is selected and you hold Shift and click on another part, all parts on the list between
the first selected part and the part you clicked on are selected. By holding Ctrl and
clicking on parts, those are either added to or removed from the selection.
When a part is damaged (inverted triangles or open triangle edges) or consists of
more than one shell, you can see that immediately in the project tree. Damaged parts
have a small caution sign at the bottom right of the colored dot next to the part name.
Parts with more than one shell have a little box at the top right of the dot.
You can start certain operations in the project tree by moving elements into other
directories by drag & drop (figure 2.3). For example, if you move a part from the
parts section into the slices section, a new, sliced part is created with certain param-eters
which you can enter in a dialog box.
Figure 2.3: To slice a part, move it into the slices section with drag & drop. The blue
bar indicates the place you drag an element to.
Further functions available are activated by double-clicks on the little icons next to
the name of objects. To the right side of the main sections, there is a little folder, by
which you can add files to the project. With the round colored dot, you can change
the color of the part. With the red X on the right side, the object is removed from the
project. One click on the little eye hides or shows the object (figure 2.4).
With the red X on the right side, the object is removed from the project. One click
on the little eye hides or shows the object.
When certain features are active, other icons are added, such as a blue plus to add
elements to the project or a green tick next to the repair directory to apply the repair.
The numbers which are depicted on the right side of parts do not perform a function,

THE VIEWING SCREEN 16
but serve as auxiliary notes to keep an overview over projects containing a large
number of parts.
Figure 2.4: Icons in the project tree preform certain functions of the program.
Many more functions of the software are available in the project tree via context
menus, if you right-click on objects.
If you select Create new group in the context menu, you can create a group of
elements as subdirectory of the respective section. You can add elements to groups
by drag & drop. This helps you with the organization of the project, especially with
enabling the simultaneous selection of several elements. Groups can be created both
in the Parts section and in the Slices secion of the tree.
2.2 The Viewing Screen
The viewing screen occupies the biggest section of the user interface. It provides
the three-dimensional visualization of a project, including parts and (optionally) the
platform. In the bottom left is a coordinate system indicating the current perspective
from which you see the project. It shows the X-, Y- and Z-axis as well as the three
planes between those axes. The size of the planes in the program vary, depending
on the current perspective, with planes in the background always displayed larger
than those in the foreground. The size of those planes can be changed in the settings
(chapter 10).
There are several intuitive ways to edit the view or performing simple tasks in the
viewing screen. The viewing perspective is changed by holding the right mouse
button and moving the mouse in the direction you want to turn the project visually
(see more in chapter 4.1).
You can also shift the view without changing the perspective, if you hold the central
mouse button and move the mouse accordingly. If you do not have a central mouse
button, for example on a laptop, hold Shift and the right mouse button.

To zoom in or out use the scroll button of your mouse. If you do not have a scroll
button, hold Ctrl and the right mouse button and move the mouse up and down (fig-ure
2.7, see more in chapter 4.2).
The moving and rotating of parts is also conducted by drag & drop. You can move a
part by left-clicking on the little green square in the middle of a selected part, holding
the button and moving the mouse (figure 2.5). If more than one part or a group is
selected, all selected elements are moved. Furthermore, selected parts can be rotated
in the viewing screen by clicking on the green brackets around the part, holding the
left mouse button and moving the mouse in the direction of the rotation (figure 2.6,
see more in chapter 5.5).
Figure 2.5: Use drag & drop to move parts.
Figure 2.6: Use drag & drop on the green brackets to rotate part.

Figure 2.7: Change perspective and zoom with right mouse button and scroll button.
Below the screen, the current mode is specified, indicating which intuitive operation
can currently be conducted with the mouse (default: Move/Rotate). If you change the
mode, for example to "Align to Bottom Plane", other operations can be performed by
the mouse (in this case a double-click on a surface of a part rotates the part to align
that surface to the X-Y-plane).
Whenever operations are conducted that are performed in other modules, the view-ing
screen switches to special interfaces, for example to the repair screen, the slices
screen, the measuring screen or the screen for Boolean Operations (figure 2.8). Intu-itive
control elements such as zooming in and out, changing perspectives and shifting
the view are the same as in the standard interface.
Figure 2.8: Left: The two-dimensional view on the slice of a part in the slice com-mander.
Right: A damaged part in the repair module.

PROGRAM CONTROL 19
2.3 Program Control
Apart from these intuitive handling elements in the viewing screen (as described
above), there are several ways to use the program’s functionality, as most features
can be found in several places.
Firstly, they are available via context menus, which are opened by a click with the
right mouse button. The content of the context menus varies greatly, depending on
where you click. It may differ with every section in the project tree, with a part in
the viewing screen and empty space in the viewing screen, and with different user
interfaces or modules (e.g. repair, measuring / figure 2.9 and 2.10).
Figure 2.9: The context menus after right-clicking on the same part in the screen
and in the project tree.
The toolbar above the viewing screen offers many features with one mouseclick.
Again, the available functions in the toolbar depend on the current user interface. The
repair module, for example, has a different toolbar to the normal screen (figure 2.11).
Functions in the toolbar and context menus are also available in the menu bar. They
are sorted into the menus "Project", "Edit", "Part", "Extras" and "View". In the "Set-tings"
menu, you can change general options of the software (figure 2.12). In some

THE PLATFORM 20
Figure 2.10: The context menu after right-clicking on a part repair in the project
tree.
Figure 2.11: The standard toolbar (top) and the repair module toolbar (bottom)
modules, e.g. the repair, specific menus are added.
Figure 2.12: The menu bar
Additional functions are available in the tabsheet in the bottom half of the context
area. Some features here cannot be found in the menu bar. In the default module,
the tabsheet provides options for the cutting function, provides the dimensions of
selected parts and tells you how many parts are selected and how many parts are
shown or hidden. For many modules, such as the Boolean Operations module or the
measuring tool, the options in the tabsheet represent the main features of the module
(figure 2.13). This makes the tabsheet indispensable for the use of the program.
To create a smoother workflow, you can perform many functions with shortkeys on
your keyboard. When you are working in the viewing screen, F2 starts the "Zoom
to selection" mode, F5 provides the platform overview, F7 activates the "Align to
bottom plane" mode and F3 switches back to the normal mode. Other shortkeys are
specified in the description of the concerned function in this document.
2.4 The Platform
The platform is the three-dimensional area in the project which depicts the actual
build platform of your machine. If you adjust the dimensions of the platform in the

FILE FORMAT OVERVIEW (PARTIALLY PRIVATE/PRO FEATURE) 21
Figure 2.13: Tabsheets of standard interface, repair module and Boolean Operations
module
software to your machine specifications, the six planes forming the platform repre-sent
the outer boundary of your print. The size of the platform can be changed in the
settings.
In the settings, you can also choose, if you want to see the platform at all. If one or
more parts are selected and you can also hold the ’p’-key to display a virtual platform.
It has the same origin coordinates as the selected part(s).
2.5 File Format Overview (partially Private/Pro fea-ture)
In netfabb Professional, there are several file formats available for importing and
exporting parts. With the Professional Tool CAD Import, there are even more possi-bilities.
Different formats have different qualities, in the following table you’ll get a
short overview:

FILE FORMAT OVERVIEW (PARTIALLY PRIVATE/PRO FEATURE) 22
Format Import Export Comment
netfabb intern
netfabb project X X
3D file formats
STL X X
STL (Ascii) X X
color STL X X can contain color/texture
x3d X X can contain color/texture
x3db X X can contain color/texture
gts X X
obj X X can contain color/texture
3ds X can contain color/texture
ncm X X
amf X X
zpr X X can contain color/texture
ply X X can contain color/texture
3mf X X only available in Windows, can
contain color/texture
binvox X X open as model with "Add part" in
project tree
zip X opens all models that are packed in
a zip
vrml, wrl X X
iges, igs X Import with CAD Import Tool
step, stp X Import with CAD Import Tool
ifc X Import with CAD Import Tool
jt X Import with CAD Import Tool
Autodesk (ipt, iam) X Import with CAD Import Tool
Catia (model, session, dlv, exp,
X Import with CAD Import Tool
catpart, catproduct, catshape,
cgr, 3dxml)
Creo (asm, neu, prt, xas, xpr) X Import with CAD Import Tool
continued on next page

ALL SHORTKEYS 23
Format Import Export Comment
Parasolid (x_b, x_t, smt,
smt_txt)
X Import with CAD Import Tool
NX (prc, prt, mf1, arc, unv, pkg) X Import with CAD Import Tool
Solidedge (asm, par, pwd, psm) X Import with CAD Import Tool
Solidworks (sldasm, sldprt) X Import with CAD Import Tool
Slices
sli X X
cli X X
slc X X
ssl X X
abf X
slm X X
cls X X
usf X X
clf X
png X
bmp X
svg X
dxf X
ps X
binvox X X can also be loaded as 3D model, see
above
Toolpath
gcode X X
gcd X X Ultimaker Engine
bgc X X Ultimaker Engine
fab X X fabbster Engine
2.6 All Shortkeys
netfabb can be controled with shortkeys. Some keys are assigned to different actions
in the different modes. See the following table for an overview...

ALL SHORTKEYS 24
... in the default mode
Action Keys Action Keys
Highlight part H Hide selected parts Ctrl+H
Zoom in Q Mesh viewer Ctrl+M
Zoom out A New project Ctrl+N
Zoom mode F2 Open project Ctrl+O
Select mode F3 Next orientation SPACE
Select all parts Ctrl+A Invert Selection Ctrl+I
Show backfaces Ctrl+B Show edges Ctrl+E
Show platform Ctrl+P Show part names Ctrl+L
Align tool F7 Previous orientation Shift+SPACE
Highlight platform P Move + along x-axis Shift+RIGHT
Screenshot to clipboard Ctrl+C Move - along x-axis Shift+LEFT
Platform info dialog F5 Move + along y-axis Shift+UP
Collision control Ctrl+K Move - along y-axis Shift+DOWN
Move part Ctrl+V Move + along z-axis Shift+PRIOR
Rotate part Ctrl+R Move - along z-axis Shift+NEXT
Scale part Ctrl+S Move right RIGHT
Triangle Reduction Ctrl+T Move left LEFT
Undo Ctrl+Z Move up UP
Redo Ctrl+Y Move down DOWN
Duplicate part Ctrl+X Move back PRIOR
Show/Hide Context area F10 Move front NEXT
Arrange Part Ctrl+Q Delete part DELETE
... in the repair mode
Action Keys Action Keys
Triangle selection F5 Repair selected faces F5
Surface selection F6 Repair selected surfaces F6
Shell Selection F7 Repair selected shells F7
Deselect F8 Delete faces DELETE
Expand selection + Shrink selection -

25
Chapter 3
Project Management
There are several methods to manage netfabb projects, read and open files and save or
export projects and parts. To save processing time, STL files with a great complexity
can be split before adding them to a project. For further processing, projects can
be saved as netfabb project files and parts can be exported into three-dimensional or
two-and-a-half-dimensional file formats. Screenshots can be exported and saved for
illustration purposes.
This chapter explains those functions in detail. Most of them are available in the
project menu (figure 3.1).
Figure 3.1: The Project Menu

OPEN FILES 26
3.1 Start Project
New
With this function in the Project menu, a new project without any content is
created. New files or objects can be inserted. Warning: Any changes made on
previously opened projects are discarded.
Undo/Redo
The Undo function in the Edit menu reverts the last operation on parts in
the default module. Only simple actions such as moving parts or starting new
modules can be undone. If an operation has replaced the original part (such as cutting
or a repair), it cannot be retrieved and the operation cannot be undone. With Redo,
you can perform the process you have undone again.
3.2 Open Files
3.2.1 Open
This function is available in the Project menu, in the toolbar or by double-clicking
on the "Open" icon in the project tree. You can open netfabb project
files, STL files and other three-dimensional files created with CAD software or slice
files previously saved in netfabb. The objects defined by those files are added to the
project. If you open a netfabb project file, the project is loaded and the previous
project is discarded.
In a file browser, you can select the file you want to open (figure 3.2).
Alternatively, files can simply be opened by drag & drop, if you pull files from your
Explorer into the netfabb window.
3.2.2 Add Part
With this feature, three-dimensional parts saved as STL files or in other file
formats can be added to the project. It can be accessed in the Part menu, in the
context menu of any element in "Parts" section of the project tree or in the context
menu of the viewing screen, if you do not click on a part, but on empty space. By

OPEN FILES 27
Figure 3.2: In this file browser dialog, search for the file you want open.
clicking on a file and clicking the "Open" button in the appearing dialog, parts are
inserted into the project (figure 3.3).
Figure 3.3: Browse for parts in the dialog box and add them to your project.

OPEN FILES 28
Advanced File Import
The Advanced File Import can be activated in the settings (see chapter 10). It
enables you to create copies, scale the parts, stitch the parts or to change their level
of detail before you add them to your netfabb project.
Whenever you add any parts in a file format representing parts with triangle meshes,
an import dialog is opened (figure 3.4). In that dialog there is a table with all parts
you are about to add to the project. For every part, you can see information on the
parts and your chosen options for the import: Quantity, part name, outbox size and
part volume, number of triangles and shells, part quality, level of detail and scaling
factor.
You can change settings for the import either for single parts in a context menu, or
for all parts with the options below the table.
Figure 3.4: The dialog for the Advanced File Import.
Change options for single parts
If you right-click on a part in the table, a context menu is opened with which you can
edit your import settings for that particular part (figure 3.5).
With the quantity, you can set how many copies of this part are inserted. If you
have more than one, a number will be added as suffix to the part name, for example

OPEN FILES 29
Figure 3.5: The context menu after a right-click on a part in the import dialog.
"Box_01" and "Box_02". The quantity can also be changed after a double-click on
the part name.
With the next option, you can rename your parts.
The level of detail changes only the display of parts and does not have any influence
on the part attributes. It is conforming with the function "Level of detail" for existing
parts in the viewing options (chapter 4.3). If you change the level of detail during
the import already, you can save computing time, as complex parts do not have to be
rendered in full detail from the start.
To set the scale of parts, you can either perform the functions inches to mm or mm
to inches before opening the parts (see chapter 6.2.3), enter a custom scaling factor
or set back the scaling to the usual part size (100%). You can find these options in a
submenu.
If you Stitch, open triangle edges are stitched together immediately, as with the
function "Stitch Triangles" in the repair module (chapter 7.5.3). This may or may
not repair the part, but will almost always improve the part quality. When triangle
edges are stitched, you can see instant changes in the number of triangles and shells
and in the part quality. If parts are damaged, there is a warning sign in the column
for the part quality (the same as for damaged parts in the project). If they are good,
there is a green check.
If you click on Remove in the context menu, the part will no longer appear on the
list and will not be added to the project.
Settings for all parts
Below the list of parts, you can edit settings which apply for all parts. For the posi-tioning
of the parts, you can choose one of three options in a dropdown menu:

OPEN FILES 30
- According to file data: All parts are positioned exactly as defined in the file.
Most three-dimensional files contain positional information.
- Move parts to origin: All parts are moved to the origin. The lowest outbox
coordinates will be X=0, Y=0, Z=0
- Arrange parts: All parts are arranged nexttogether in the platform, with their
outbox as reference. The first part is inserted at the origin.
If the box Stitch all is ticked, the triangles of every part are stitched when you add
the parts.
The General level of detail sets the level of detail for all parts. Choose a value in
the dropdown menu. If you tick the box Set LOD (level of detail) as default, your
level of detail value will become standard for the Advanced File Import.
The option Move stitched parts into group generates a group in your project into
which all added parts which have been stitched are moved. Parts that are not damaged
or cannot be stitched at all, but are stitched nevertheless (for example with the option
"Stitch all") are not moved into this group.
In the bottom left there is the option Always use this dialog. If you deactivate this,
the advanced file import will no longer appear when you add parts. You can reactivate
it in the settings.
If you increase the quantity of the single parts to more than 5, you can let the parts
be organized in groups. For example, you open a part and want to load it 12 times,
change the Automatic grouping of parts to more then 10 duplicates. All 12 parts
will then be organized in 1 group in the project tree.
3.2.3 File Preview Browser
The File Preview Browser is available in the Project menu and opens a browser
window in the tabsheet, where it is possible to search for and open files. If
you click on a file name, a preview of the object is displayed on the viewing screen
without it being added to your project. You can also scroll through files with your
cursor buttons. The preview can be obtained for both three-dimensional files and two-and-
a-half-dimensional slice files with various file formats. Clicking on "Open" or
double-clicking on the file name inserts the selected file into your project. That way,
the file preview browser allows a quick browsing of databases without necessarily

OPEN FILES 31
opening each part to look at it (figure 3.6, 3.7). Viewing options such as zooming in
and changing perspectives are available as in an open project.
Figure 3.6: The File Preview Browser offers a preview of files without adding them
to the project. Here, an STL file is viewed.
Figure 3.7: A preview of a slice file, zoomed in.

OPEN FILES 32
3.2.4 Split STL Files (Private/Pro feature)
This option is available in the Project menu. Effectively, this function per-forms
the cutting and scaling of a part before opening it. STL files with a great
complexity are split into smaller sections before adding them to a project. Thus, it is
possible to load only a section of the part, which can save a lot of processing time.
Additionally, the file size can be reduced by scaling the object before opening it.
When you start the feature, you have to choose a file in a file browser. Then, the
parameters for the function can be set in a dialog box.
The STL Information specifies the size of the outbox of the part, the number of
triangles and the size of the STL file. The outbox is a cuboid space enclosing the
part.
In the bottom half, you can insert your specifications for the splitting and the scaling
of the file. With the first three fields, you can scale the part by setting percentage
values for the dimensiona along the X-, Y- and Z-axes.
Next, you can enter a value for each axis to set the number of split parts, into which
the original part is cut along this axis. The part is split into parts with equal dimen-sions
along one axis. The file suffix will be added to the file names (figure 3.8).
Figure 3.8: In this example, a helix is split across the Z-axis into 10 sections with
equal height.
By clicking on "Create Decomposition", the part is scaled and split according to your
settings and new STL files are created, consisting only of the respective sections of

OPEN FILES 33
the original part. The original part is not replaced (figure, 3.9).
Figure 3.9: The resulting files are listed in the File Preview Browser.
Finally, you can open these split parts one by one without adding the whole part to
the project (figure 3.10).
Figure 3.10: Two of the resulting split parts are added to the project, with their
dimensions specified in the tabsheet.
3.2.5 Create Report (Pro feature)
The report creation feature is available in the Project Menu. netfabb helps you
with making official documents and quotations containing information about
the models.
When you have done measuremts on your part, you can also export this view includ-ing
the measurings into the reports. Simple stay in (or go back via the project tree
into) the measure mode and open the reports from there.
Once the .odt-file is be created, you can see screenshots of the part and data according
to the form you chose (figure 3.11). You use these documents as templates and hand
out these documents to your customers or co-workers to tidy up your workflow. With
Create Report in the Project Menu, you get a dialog wheren you can choose one of

OPEN FILES 34
Figure 3.11: Choose a report: A document/template with important information for
manufacturing or quoting the parts will be created.
the reports (figure 3.12). After you have opened the document, you can simply print
or edit it to a quote and add notes.
Figure 3.12: Reports and templates for advanced part analysis (left), platform views
(middle) and quotes (right)

OPEN FILES 35
3.2.6 Professional Tool: CAD Import (only available with Pro)
If you have acquired the Professional Tool CAD Import, you can convert native CAD
data inside netfabb. To import a file in a CAD format, click on Import CAD file... in
the Project menu. A new tabsheet is displayed and you can load a part by choosing
Open and selecting it in the browser (figure 3.13). You’ll now see a preview of the
CAD file and you can determine in what level of detail you want to load it. A low
level is comfortable when you only need to view the part and calculate a quote. A
high level is recommended when you need to edit and/or manufacture it. With a
check at the auto update, the changes will be performed immediately, but have the
longer calculation times in mind. Then choose the unit your part is supposed to be.
The preview will tell you how many triangles your part contains, you can decide if
you want the mesh to be displayed (Show triangles) and split assemblies into parts
which means that you can load and prepare shells seperately from each other.
Click on Import to actually load the file in netfabb.
Figure 3.13: The CAD Import dialog importing an IGES file.

SAVE AND EXPORT 36
3.3 Save and Export
3.3.1 Save
If you choose Save in the Project menu, the project is saved and its previously
saved version is overwritten.
If you choose Save As or if there is no existing version of the project, a dialog
window is opened, in which target directory, file name and file type can be
chosen (figure 3.14).
Figure 3.14: Choose target directory and file type and insert file name in the browser
dialog.
3.3.2 Export Project to STL (Private/Pro feature)
The entire project, possibly consisting of many different parts, is saved as one
single STL file. Target directory and file name can be chosen in a file browser.

SAVE AND EXPORT 37
3.3.3 Export Part
The option Export can be found in the Part menu or in the context menu after
right-clicking on a part in the screen or in the tree. It saves selected parts
in either a 3D triangle mesh or slice file format. The new files are then saved in a
selected directory.
First, select all parts you want to export. When you move the mouse to Export, a
submenu opens where you can either choose a triangle mesh format or slice files in
general. If you export more than one part, you will be able to change the format
again in the Export dialog box. For exporting a part into a three-dimensional file, the
same file types are available as for opening files (chapter 2.5), plus the AMF and the
VRML format.
If you export a part as slice, a slice file is created without the intermediate step of
viewing and checking it in the Slice Commander. The options for directly exporting
slice files are the same as for exporting slices.
Export Parts to triangle mesh formats
After clicking on a format, a dialog box opens for altering your export options (fig-ure
3.15).
In the field Parts, the number of selected parts is given. Next, you can change the
format of the target files in a dropdown menu. You will get different export options
for the different file formats (figure 3.16).
For the output type, you can choose if you want to save all selected parts in one file
or save all parts in different files. For different files, choose if you want to give them
a common file name with numbers, a common file name with part ID (the part
number in the project, see chapter 5.7), save them with their original part names
in the project and a loading list, or create file names with a common file name
and the original part name (figure 3.17). With the option "Original file name with
loading list", an additional XML File is saved which contains a list of all exported
files. If you open that XML file with netfabb, all files in the list are opened at once.
The common name for all other options can be entered in the next text field. Click on
the button "..." to edit the target folder. In the field Example, you can see a preview
to how your files will be named.
At the bottom of the dialog, there is a tabsheet with the two registers File quality and

SAVE AND EXPORT 38
Figure 3.15: The dialog box for exporting parts as STL files.
Figure 3.16: The dropdown menu for the export format.

SAVE AND EXPORT 39
Figure 3.17: The dropdown menu for the output type.
Outbox.
In the register File quality (figure 3.18), you can use the button Check to see if the
files you are about to create may cause errors when they are opened again. You can
tick a box at the bottom of the dialog to always check file quality when the export
dialog is started.
After checking, the number of degenerated faces and manifold edges is specified in
the text fields. Degenerated faces are very tiny or thin triangles and can result in little
holes. Manifold edges are several triangle edges at the same coordinates and may
be split open. The tolerance value you can enter below determines the precision
with which errors are calculated. If the distance between two triangle corner points
is below the entered value, they are interpreted as one point and will be reported.
If there are any problems, a red X is displayed on the right. If the files are error-free,
a green tick is displayed. With the button Optimize you can fix the errors
automatically. The files are rechecked and should become good. Sometimes, you
have to repeat the repair.
In the register Outbox, the dimensions of all selected parts are given. First, you get
the length of the outbox along all three axis, then the minimum and maximum values
along the axes.

PRINTS AND SCREENSHOTS 40
Figure 3.18: Top: The file quality has not yet been checked. Center: The exported
files have degenerated faces and manifold edges. Bottom: After clicking on "Opti-mize",
the files are error-free.
3.4 Prints and Screenshots
Print
This function in the Project menu directly prints the current view of the
project. With "Configure Printer", you can edit the settings for the printer.
Screenshot to Clipboard

PRINTS AND SCREENSHOTS 41
This feature is available in the Edit menu and copies a screenshot of the view-ing
screen into the clipboard. The screenshot then can be inserted into other
files.
Save Screenshot
With this function in the Edit menu, a screenshot of the viewing screen is
saved as PNG file in any chosen directory.

42
Chapter 4
Viewing Options
The view to a project in the viewing screen can be altered in many ways. The per-spective
from which objects are seen can be set to seven different standard directions
or can be intuitively rotated by use of the mouse. To shift the view on the displayed
project or to zoom in and out, you can also use the mouse very easily, or use one of
several standard zoom options.
Figure 4.1: The View menu

PERSPECTIVES 43
Furthermore, it is even possible to hide objects, which makes it easier to keep a clear
overview of the project.
To have an unhindered view on chosen parts without removing any others, you can
also hold the ’h’-key to highlight selected objects, which will be displayed in the
foreground, regardless of their position.
Further options for viewing the screen include the level of details, highlighting back-faces,
displaying the triangle mesh of any chosen part, edges on parts and the plat-form.
4.1 Perspectives
The perspective refers to the direction from which a project is viewed. In the
bottom left of the viewing screen is a coordinate system indicating the current
viewing perspective (figure 4.2).
Figure 4.2: Three Different Perspectives with the Coordinate System
To change the perspective, there are two ways. First, by holding the right mouse
button and moving the mouse in the direction you want to turn the project visually,
the perspective can be intuitively rotated to any position, with the center of the screen
as center of rotation. If you right-click close to the edge of the screen, the perspective
is only changed two-dimensionally to the left, right, up and down.
If you want a certain point on a part as center of rotation, right-click on this point
and click on "Center View Here" in the context menu. Your view will be shifted and
the point you clicked on moved into the center, subsequently becoming the center of
rotation.
Second, there are seven standard perspectives. The perspecitves from the top, bot-tom,
left, right, front and back refer to the coordinate system, whereas the front is

PERSPECTIVES 44
the X-Z-plane. The isometric view is a view from the front-left-top-corner of the
platform. That way, you gain a kind of three-dimensional view on the project and on
objects which are aligned along the axes (figure 4.3) .
Figure 4.3: A part viewed from all standard perspectives
There are three ways to switch between those standard perspectives:
1. They can be selected with one mouse click on the respective icon in the toolbar
or by selecting one of the perspectives in the View menu.
2. The colored planes in the coordinate system are further shortcuts to the stan-dard
perspectives. With default color settings, by clicking on the grey space
in the center, the perspective shifts to the isometric view. Clicking on the blue
space switches between the views along the Z-axis (top and bottom), the red
space switches between views along the X-axis (left and right) and the green
space switches between views along the Y-axis (front and back).
3. You can also switch forwards between them with your Space key or switch
backwards with Shift and Space. If you have not yet set a standard perspective,
the first is the isometric perspective.

CENTERING AND ZOOMING 45
4.2 Centering and Zooming
Shift View
By holding the central mouse button and moving the mouse, the view on a project
can be shifted to the right, left, up or down. This changes only the centre of the main
screen without changing the perspective. If you do not have a central mouse button,
hold Shift and use the right mouse button.
Center View
When you right-click on a part in the screen, the option Center View Here
is available in the context menu to shift the view. The point you clicked on
is then moved into the center of the viewing screen. The option is also available in
the View menu. After selecting the option there, left-click on the point you want to
move into the center.
Zoom
The scroll button of the mouse can be used to zoom in and out. If you roll forward,
you zoom in and if you roll backwards, you zoom out. If you do not have a scroll
button, hold both Ctrl and the right mouse button and move the mouse up and down.
With the keyboard, you can zoom in with Q and zoom out with A.
Additionally, there are several default options to center and zoom. Depending on
which function you choose, netfabb moves certain components into the center and
resets the zoom so that these components fit exactly into the screen. These options
are available by clicking on the respective icons in the toolbar or in the View menu.
Figure 4.4: The Zoom Options in the toolbar
Zoom to Parts
The parts of the project will fit exactly into the screen.

CENTERING AND ZOOMING 46
Zoom to Selected Parts
The screen will include all selected parts.
Zoom to Platform
netfabb calculates a frame for the viewing screen which contains the platform.
Zoom to All
The View will include all parts and the whole platform.
Zoom to Selected Area
This activates a different mode and is also available by pressing F2. It enables
you to choose a selection by holding the left mouse button and dragging a selection
rectangle. netfabb then zooms in to that selection (figure 4.5). In turn, you do not
select parts by clicking on them and cannot move or rotate parts by drag & drop. You
get back to the normal mode by pressing F3 or clicking on the respective icon in the
toolbar (with the mouse cursor depicted on it).
Figure 4.5: Left: A selection rectangle is dragged. Right: netfabb zooms in to that
area.

DISPLAYING OPTIONS 47
4.3 Displaying Options
Hide and Show Parts
Selected objects can be hidden or shown by choosing the respective option in
the context menu or by clicking on the orange eye next to the objects name
in the project tree (figure 4.6). When an object is hidden, this orange eye turns grey.
Hiding objects that do not need attention for the moment can be helpful to keep a
clear overview on the project. In the tabsheet, there is a small info box specifying
how many parts in the project are hidden.
Figure 4.6: Click on the eye to hide a part.
To prevent an obstructed view to parts in the background, marked parts can also be
highlighted and displayed in the foreground by holding the ’h’-key.
In the context menu of the viewing screen and of parts in the project tree or in the
View menu, several additional options are available for showing and hiding parts:
If you right-click on empty space in the screen, you can either show all parts, hide
all parts, invert the visibility of all parts or hide unselected parts (so only your
selected parts are displayed). If you right-click on a part in the screen or in the project
tree, you can either show or hide only your selected parts (or "hide unselected parts"
as well). As the selection may change with the right-click, it can be necessary to
access this function in the project tree or in the View menu. In the screen, it makes
only sense, if at least one part of your selection is shown already and you click on
that part.
Level of Detail
The level of detail of the displayed project can be changed either in the View
menu or in the toolbar. You can choose from several levels between 0.1% and
100%. These levels are implemented for all selected parts or, if no parts are selected,
for all parts (figure 4.7). In the project tree, the current level of detail is specified in
brackets after the part name.

Figure 4.7: Low and High Level of Detail
The simplified presentation is especially recommended for projects containing very
much or very complex parts. With a low level of detail the program will be much
quicker whenever the view is changed in any way, because parts are no longer dis-played
in every detail.
Despite the simplified presentation, the actual attributes of the parts remain un-changed.
Highlight Backfaces
The interior side of triangles is always marked red, even if the part is selected. It helps
you to detect inverted triangles, holes and cuts in the standard module (figure 4.8).
You can activate and deactivate that option in the View menu.
Figure 4.8: Highlighted Backfaces are marked red.
Show Edges
This option in the View menu determines, if sharp edges on objects are emphasized
with black lines (figure 4.9).

Figure 4.9: Part without and with visualized sharp edges
Show Platform
The platform is the printable area of the project (chapter sec:Platform). It can be
shown or hidden in the View menu.
If one or more parts are selected and you can hold the ’P’-key to display a virtual
platform with the same origin coordinates as the selected part (figure 4.11). That
way you can estimate how much space your selected parts will occupy in the platform
if you move them to the origin.
Figure 4.10: If you hold ’P’, a second platform is displayed with the origin coordi-nates
of the selected part.

Show part names
If you have loaded many parts, you can get a better overview when you let netfabb
show the part names in the viewing screen. Activate it in the View menu or with
pressing Ctrl + L.
Figure 4.11: Activate the display of part names with Ctrl + L.
Show Triangle Mesh
This option activates or deactivates the visualization of the triangle mesh of a part
(figure 4.12). It can be found in the context menu after right-clicking on the respec-tive
part in the main screen or in the project tree.
Figure 4.12: Hide or show the triangle mesh.

MESH VIEWER - SHOW COLOR AND TEXTURE (PRIVATE/PRO FEATURE) 51
4.4 Mesh viewer - Show color and texture (Pri-vate/
Pro feature)
If a part (in .x3d, .3ds, .zpr and .ply formats) has saved textures or color in-formation,
they can be made visible in the Mesh viewer (figure 4.13). This
module is available in the View menu in the toolbar. In the Display box, you can
show the triangle mesh or make the whole part transparent. With clicks on Texture
or Color, both will be made visible if available.
Figure 4.13: In the Mesh Viewer textures and colores are displayed.
It is also possible to allocate one color to the whole a part: With a click on Change
Color, you can choose a color from the pallet. This doesn’t change the appearance
of the model in the netfabb default display, but this color will be printed if you have
a machine that can handle and print color information. Delete color and texture
erases these additional information from a part (figure 4.14).

MESH VIEWER - SHOW COLOR AND TEXTURE (PRIVATE/PRO FEATURE) 52
Figure 4.14: Choose your own color for a part or delete the whole color/texture
information.

SELECT PARTS 53
Chapter 5
Part Management
The part management for netfabb includes the creation of primitive parts,
the duplication of parts, part attributes, positioning and scaling, a platform
overview and collision detection. For managing and editing parts, they must be se-lected
first.
5.1 Add and Remove Parts
Saved parts can be added to the project either with the function Add Part
(chapter 3.2.2) or with the File Preview Browser (chapter 3.2.3). You can
also add parts by drag & drop, if you pull them from your windows folder into your
netfabb window.
A selected part in the project can also be removed and deleted from the current
project. This function can be accessed via the Part menu, in the context menu
after right-clicking on the part to be removed, by double-clicking on the red X-icon
next to the part in the project tree or by pressing the Delete key on the keyboard after
selecting the part.
5.2 Select Parts
For any kind of viewing, handling or processing operation in netfabb, it is
essential to first select the part you want to edit.
Parts can be selected by simply clicking on them in the main screen or in the project

SELECT PARTS 54
tree. Selected parts are always colored green, framed by green brackets and marked
in the project tree. In the tabsheet, below the cutting functions, information is given
regarding the size, volume, area and number of triangles of the selected part. Below,
you can see how many parts are selected and how many parts are in the project in
total (figure 5.1).
Figure 5.1: Information about selected parts is given in the tabsheet.
You can select as many parts as you like. If you hold Shift, parts are added to
the selection by clicking on them. By holding Ctrl, parts can be both added to or
removed from the selection by clicking on them. If you select parts in the project
tree, the Shift key works differently, as holding Shift and clicking on a part selects
all parts in the list between the part clicked on and the last part selected without Shift.
By holding the left mouse button and dragging a selection rectangle with the mouse,
you can select everything within that frame (figure 5.2).
Figure 5.2: Select several parts at once with help of a selection rectangle.
In the context menu of the viewing screen, if you do not right-click on a part, but

SELECT PARTS 55
on empty space, you can either select all parts, select no part to clear the selec-tion,
or invert the selection. With that last option, selected parts are deselected and
unselected parts are simultaneously selected (figure 5.3). All three options are also
available in the Edit menu.
Figure 5.3: Left: If you right-click on empty space in the screen, the context menu
offers general options for your selection. Right:The inverted selection of figure 5.2.
Additionally, as a shortkey, you can press Ctrl+A to select all part in the project tree.
If two or more parts are selected, the information in the tabsheet is then based on
all selected parts. Many, though not all, handling operations are conducted with all
selected parts.
5.2.1 Advanced Part Selection (Private/Pro feature)
The Advanced part selection is a feature with which you can select parts
with certain properties. It is available in the Part menu or in the context menu
after a right-click on empty space in the viewing screen. (figure 5.4)

SELECT PARTS 56
In the bottom half of the dialog, in the field Selection Preview, there is a list of parts
which would be selected with the current conditions. If you tick the box Add to
current selection, parts which are already selected remain selected. Otherwise, the
selection is replaced.
Figure 5.4: Select parts by their outbox dimensions, volume, quality, number of
triangles or Z Height).
Select parts by outbox
To select parts by their outbox size, enter limit values for the three axes into the text
fields on the right. In a dropdown menu on the left you can choose if you want to
select parts with outbox dimensions larger or smaller than those values. Below, you
can choose if you want only one outbox dimension or all outbox dimensions to
match the conditions defined above. With the option Ignore orientation, the values
are no longer assigned to one specific axis. So, it does not matter how the parts are
oriented.

SELECT PARTS 57
Select parts by volume
To select parts by volume, open the dropdown menu on the top and choose if you
want to select all parts with a volume larger or smaller than a certain value. To the
right, you can enter that limit value in the text field. Please note that parts with holes
do not have a volume and cannot be selected here.
Select parts by quality
If you select parts by quality, you can choose from several criteria in the dropdown
menu. Valid parts are all closed and correctly oriented parts. Faulty parts are all
parts which are not valid. Closed parts are all parts without any open triangle edges
or holes. The orientation is ignored. Parts with holes do have open edges. Oriented
parts, unlike non-oriented parts, are parts where all triangles are oriented correctly,
with the outside of a triangle on the outside of the part. Further options are Parts with
more than one shell, Parts with exactly one shell and Parts without triangles.
Select parts by their number of triangles
To select parts by their number of triangles, open the dropdown menu on the top and
choose if you want to select all parts with more or all parts with less than a certain
number of triangles. To the right, you can enter that number of triangles.
Select parts by their Z Height
You can select parts by their Z Height which can be quite practical for packing a
build volume. Choose if the parts are supposed to be completely over or under a
certain value or if they partially can be smaller or bigger.

STANDARD MODELS - THE PART LIBRARY (PARTIALLY PRIVATE/PRO
FEATURE) 58
5.3 Standard models - the part library (partially Pri-vate/
Pro feature)
Standard models are simple three-dimensional objects that are can be created
with a few clicks in netfabb. After clicking on the Part library icon in the
toolbar or choosing the respective option in the Edit menu, the user can choose from
a list of simple three-dimensional objects that can be selected with a double-click and
inserted into the project (figure 5.5). Although their basic geometry is already given,
there are many parameters that can be specified in detail by the user.
Figure 5.5: Choose a primitive in the main screen.
That way, you can create a variety of parts. The settings can be saved as default
setting for the primitive part by clicking on the button below. The button "Load
Default" restores the default settings after the parameters have been changed. By
clicking on Apply, the part is inserted into the project. In the following list, you can
find a short description of each parameter:

FEATURE) 59
Primitive Parameters
Term Function
Caption Type in the actual text (text primitive) or label
your part (mould, whistel)
Clearance to screw define a distance between the threads of screw
and nut
Color Determines the color appearance in netfabb
(only display in the software, not in reality)
Count holes (in X-/Y-Direction)
number of holes in each direction
Depth measures of part in z-axis
Design choose a round, oval or rectangular shape for
the mold
Direction models facing up- or downwards
Edges number of edges the surface has
File click here to browse for a file
Fit choose if the bracelet should be loose, closed or
balanced around your wrist
Font determine the font, size and effects
Good Triangles good triangles have no acute angles (there is no
angle below 90)
Handles add any number of handles to your vase
Height measures of part in z-axis
Height partitions devides the triangles in the z-axis by this certain
number
Horizontal mesh den-sity
changes the resolution of the bracelet. the
higher the number, the higher the resolution
Invert Colors Concers Bitmaps and Heightmaps: Usually all
dark colors are being filled/raised. With Invert
Colors it’ll be the other way round and only all
bright colors will be filled/raised
Keep aspect ratio With a no, measures in x-axis and y-axis can
be changed independently.

FEATURE) 60
Term Function
Kind of head available are hexagon socket, hexagon head and
slotted
Lead length length in z-axis, until one rotation of helix is
finished
Length measure of part in x-axis
Level of detail resolution of part in Bitmaps and Hightmaps
Level of grey determines how many colors are detected in
Bitmaps and heightmaps (up to 250 are possi-ble)
Metric thread Diameter of the screw’s thread (uses standard-ized
parameters)
Name This name will appear in the project tree.
Nominal diameter Diameter of the screw’s thread (uses standard-ized
parameters)
Number of gears / teeth number of rotations in Helix / number of teeht
in gear wheel
Pitch determines the angle of a lead in the helix
Profile rotation angle defines how the surface is aligned
Radical edges changes the resolution of the vase. the higher
the number, the higher the resolution
Radius Changes the radius/size of parts
Resolution defines the resolution of the part’s surface. the
Rotation Angle angle of bending (in Rotation Hyperbolid)
Smooth triangles edges of model will be less sharp
Spin rotates the picture sweep from start to end by a
specific angle
Steps changes the resolution of the picture sweep. the
Style choose from three different shapes in the
bracelet pritimitve

DUPLICATE PARTS 61
Term Function
Surface type in desired size of surface, other measures
will be adjusted
Tangential edges changes the resolution of the vase. the higher
the number, the higher the resolution
Thickness of bars Width of each ber between two holes (in cylin-der
with hexagon grid)
Thread Length Length of the thread only, without head
Tolerance A higher tolerance makes the roundness of parts
less accurate and results in a lower number of
triangles.
Triangle Edge Length max. length of triangles edges
Triangles number of triangles
Turns determines how many turns you need in your
helix
Type choose between predefined models
Vertical mesh density changes the resolution of the bracelet. the
Volume type in desired volume, other measures will be
adjusted
Wall thickness distance between inner and outer shell
Width measures of part in y-axis
Wrench size distance between two opposite edges of the
outer nut contour
Wrist circumference determines the inner circumference of the
bracelet
5.4 Duplicate Parts
This feature can be accessed via the Part menu or in the context menu after
right-clicking on the respective part and creates a chosen number of exact
copies of the selected part. In a dialog box, you can set the overall number of copies.
So, if you want to create one duplicate, you have to set the counter to two copies.

DUPLICATE PARTS 62
Below, there is a little box Arrange Parts. If it is not ticked, the duplicates will
be placed in the same place as the original part. If it is ticked, you can place the
duplicated parts at specified positions next to the original part. Therefore, you can
change the number and the distance of duplicates in each direction (figure 5.6).
Figure 5.6: Left: The dialog box for creating duplicates. Right: Duplicates of an
ellipse-torus.
To define how many duplicates shall be arranged next to the original, you insert the
number of copies along all three axes. As this includes the original, the minimum
value is always one (even if you manually insert zero or a negative value, the count
will be one). The number of copies along the three axes is always adjusted when you
change the total count of copies.
If the box auto-adjust total count is not ticked and you change the number of copies
along one axis, the count of duplicates along the other axes is adjusted automatically
so that the number of total copies stays the same. If the box to the left of an axis is
unticked, the count along this axis will not be adjusted.
If the box auto-adjust total count is ticked and you change the number of copies
along one axis, the total count is automatically adjusted instead of the count along
the other axes.

POSITION AND SCALE 63
Next, you can edit the distance of arranged copies along the three axes. The value
you enter always refers to the outbox of the parts. If you insert zero, the lowest coor-dinate
value of the second part will the same as the highest of the original/previous
part. If you increase the value, the distance becomes bigger, while with negative
values, the parts may overlap. The standard value is 2mm.
The total expected size of all duplicates is calculated in the bottom third of the dialog.
If you have selected more than one part, the whole arrangement of selected parts is
treated as if it was one part.
5.5 Position and Scale
You can move, rotate or scale parts easily by the mouse or by giving netfabb specific
coordinates, angles and scaling factors.
5.5.1 Move Parts
Parts in a project can easily be moved with the mouse by drag drop, left-clicking
on the green square of a selected part and moving the mouse. If more
than one part is selected, they are all moved together.
For finer adjustment, selected parts can also be moved up, down, left and right with
the arrow keys and backwards and forwards with the Page Up and Page Down keys.
Normally, this movement is conducted in relation to the current perspective. If you
hold Shift, the Left and Right keys move the part along the X-axis, Up and Down
move it along Y-axis and Page Up and Page Down move it along the Z-axis.
Alternatively, by clicking on the Move icon in the toolbar, choosing Move in
the Part menu or context menu or by pressing Ctrl+V, the user is able to set specific
coordinates in a dialog window, to which the selected parts are subsequently moved.
At the top of the dialog, the current selection, the part’s position and size are spec-ified.
Below, coordinates can be inserted either as absolute position or as relative
position. The absolute position is the position in relation to the coordinates X=0,
Y=0, Z=0, whereas the relative position refers to the current position. If a part is
moved to the origin, its outbox is positioned at the coordinates X=0, Y=0, Z=0. You
can also move the center of the part to the origin or just move the part down to the
platform.

Figure 5.7: The dialog box for moving parts
If the box Keep window open is ticked, you can apply the changes by Translate,
the dialog will stay open and you immediately can move the part again. (figure 5.7).
5.5.2 Rotate Parts
Similarly to moving parts, they can also be rotated easily with the mouse. This
is performed by left-clicking on the green brackets of selected parts, holding
the mouse button and moving the mouse in the direction in which you want to turn
the part. Thereby, the axis of rotation is normally the direction from which the part is
seen, but if you hold Ctrl, the part is rotated around the closest main axis (figure 5.8).
This function is available in the toolbar, in the Part menu or by pressing Ctrl+R.
Figure 5.8: Click on the green brackets and move the mouse to rotate a part.
Alternatively, parts can be rotated by a specific angle around one of the three axes
(figure 5.9). In the Rotate parts dialog, you see the current selection, its position

and size are shown, as well as the rotation center. Now you can either click on a
standard angle (45, 90, 180 or 270) or insert an angle in the empty field. Below,
define the X-, Y- or Z- or your own free axis as axis of rotation.
Figure 5.9: The dialog box for rotating parts
If the box Keep window open is ticked, you can apply the changes by Rotate, the
dialog will stay open and you immediately can rotate the part again.
5.5.3 Align Parts
By clicking on the Align icon or pressing F7, the align-mode is activated.
You can control the orientation of parts either to the platform or to other parts.
First, choose the part you want to align, then click on the align parts icon. A new
tabsheet will open up on the right. (figure 5.10)
Then select how you want to align the part to the other part. You can:
align parallel (both surfaces direct in the same direction)
align antiparallel (the surfaces direct in the opposite direction)
align perpendicular (one surface stands on the other one in a 90 angle)

Figure 5.10: First choose the part you want to align, then click on align parts. The
new tabsheet offers various options for the alignment.
translate two points (click on one point on each part and they will be laid on
top of each other)
Click on the surface of the selected part which should be orientated, then click on the
surface it should be aligned to on the other part. In the example of the screenshots,
we want to align the bottom of the screw to the leaning side of the frustum of pyramid
(figure 5.11 and figure 5.12).
Figure 5.11: Example: Choose the second icon align antiparallel. After that, click
on the bottom side of the screwhead and then click on a leaning surface of the other
part.
The single steps of your alignment are now listed in the tabsheet. A new icon has
appeared:
Set the distance of the two surfaces: When you open this dialog and type in
0.0 mm for example, the part will be moved parallel so that the two surfaces have a
distance of 0.0mm.

Figure 5.12: Result: The two selected surfaces are aligned in the oposite direction.
Now you have three options to continue with the calculations:
You can undo unwanted steps.
You can undo all the steps at once and start again.
Apply the changes and stay in the aligment mode do continue with further
actions.
To move the two surfaces lying exactly on top of each other, choose translate point
and click on one point on the bottom of the screwhead and on one point of the regard-ing
surface of the frustum of pyramid. The two parts will be moved closely together.
Click on apply and you can continue with other actions (for example the boolean
operation (see chapter 6.6)).
When you open the aligment mode a second time, you see three more icons on the
upper right corner. With those you can align the surfaces to the x-, y- and z-axis
(figure 5.13).
Figure 5.13: Left: The part is lying leaning in the platform. Right: The part is
aligned and laid down to the bottom plane.
When you have found the perfect alignment for your parts, click on Apply in order
to get back to the default mode.

5.5.4 Scale Parts
By clicking on the Scale icon, choosing Scale in the Part menu or context
menu or by pressing Ctrl+S, the dimensions of one or more selected parts
can be changed. In the Scale Parts dialog window, the current selection, the part’s
position, size and its scale center are displayed.
First, you can insert the factor, by which the length along the respective axis is mul-tiplied
(figure 5.14).
With factor 1.00, the dimension remains the same. With a factor bigger than 1.00,
the part is enlarged, while with a smaller factor than 1.00, the part is shrunk. If you
insert a negative value, the part is inverted. It’s also possible to scale by percentage
or enter the actual desired part size.
Figure 5.14: The dialog box for scaling parts
With the Fix scaling ratio box ticked, the dimensions of all three axes are scaled
by an equal factor and consequently makes the whole part bigger or smaller. With
unequal scaling however, different factors can be entered for the three axes. Con-sequently,
the scaling process changes the proportions of the part’s geometry and
changes the part’s shape (figure 5.15).

Figure 5.15: The part scaled unequally only along one axis and becomes distorted
in the process.
If the box Keep window open is ticked, you can apply the changes by ?Scale?, the
dialog will stay open and you immediately can scale the part again.
5.5.5 Arrange Parts (partially Pro feature)
All parts in the project are arranged automatically in the platform, avoiding
any collisions. The outbox is taken as reference (figure 5.16). The function is
available in the Edit or in the context menu after right-clicking on empty space in the
screen.
Figure 5.16: Left: A project with randomly scattered parts. Right: With Arrange
parts, the parts are sorted in the platform.

PROFESSIONAL TOOL: AUTOMATIC PACKING (ONLY AVAILABLE WITH
PRO) 70
In a dialog window, you can set the accuracy and the minimal distance between the
parts (figure 5.17). The accuracy determines the rastersize for the calculation, as the
software calculates a three-dimensional raster across the platform. No two parts will
touch the same raster cell. The distance determines the minimum distance between
the outboxes off the parts. The outbox is visualized with green brackets if the part is
selected.
Figure 5.17: The dialog box for the arranging parts.
With the option only 2D the parts will be arranged two-dimensionally on the botton
plane of the platform. Parts which do not fit onto the bottom plane are moved out of
the platform.
In the next tab, you can decide wether you want to confirm or change your settings
every time you recall the function with Ctrl + Q or not. Click on Arrange parts to
start the calculations.
5.6 Professional Tool: Automatic Packing (only avail-able
with Pro)
The Automatic Packing tools enable you to 3D-nest your parts in a build vol-ume.
Different than the function Arrange parts, this tool does not pack parts
due to their outbox but due to their actual shape. There are parameters for settings
which regard the packing density, speed and outer restrictions. The Automatic pack-ing
is available in the Edit menu (Automatic Placement) or in the tabsheet in the
lower right corner. Here in the manual it’ll frist be described what all three editions

PRO) 71
from the Small version on can do and then the additional features in the Medium and
Large editions.
5.6.1 Small
Automatic Packing Small includes a build space of 250x250x350mm. First, deter-mine
the minimum distance between the parts and then the accuracy. (figure 5.18)
The smaller the distance and the higher the accuracy the more precise you can pack
the parts. Then define how many rotation steps along the z-axis are possible: the
lower the degree value the higher the efficiency. Mind that with this high efficiency,
the calculation time will increase.
Figure 5.18: Define the parameters in the Packing dialog
If you allow the part to be flipped upside down, the parts can be rotated along
the x-/y-axis if it’ll help to pack more precise. You can also choose to pack only
the selected parts and to place non-fitting parts outside the platform. Limit the
platform height if you want to limit the duration of the build job and determine the
distance to the platform border and its ceiling. Now click on Pack Platform to have
you parts arranged. (figure 5.19)

PRO) 72
Figure 5.19: A whole skeleton project supposed to be packed.
In the tabsheet you’ll see a striking red cross or a green check. This indicates if any
parts contact each other or not. In the top left, there is a notice if a collision has been
detected. To update the collision detection, click on the button in the top right. This
will activate a new calculation and a new highlighting of collisions in the viewing
screen.
If you tick the box Auto-update, an update will be performed every time you move a
part. If you tick the box Update drag drop, a live update is conducted even during
the positioning of the part with drag drop. This helps you to position parts very
precisely, but can result in long calculation times when complex parts are handled.
The box Display collisions has to be ticked, if you want collisions to be visualized.
Again, you can save processing time by deselecting this box and ticking it only after
certain working steps. If any parts are hidden in the build volume, it’s recommended
to also check invisible parts.
To the right of the red X or green check, six arrow-buttons are available to move
selected parts by specific distances to the left, right, up, down, backwards and for-wards.
When you use these arrows to move parts, netfabb will always move the part

PRO) 73
Figure 5.20: The skeleton placed in the build volume.
along one of the three axes. The axes are assigned to the arrow buttons depending on
the current perspective.
With a click on the 3D Packing the starting dialogue will be opened again and you
can perform another packing process. Planar packing has almost the same functions
as 3D Packing, but only nests in 2D. The Interlocking test checks if two parts that
don’t have direct contact are entangles in a way that you can’t seperate them from
each other anymore. Interlocked parts will be selected.
5.6.2 Medium and Large
n the Automatic Packing Medium, you can pack an unlimited number of
parts in a buildspace of 400x400x650mm. In the Large version, it’s up to
1000x1000x1000mm. For information about the basic functions of this tool, please
read chapter (above).
For a direct slice output for EOS machines, click on Advanced Slicing. Parts and
platform contraints are checked again. The EOS SLI format is chosen already, then

PART ATTRIBUTES 74
enter the desired filename and the layer size. Enable Slice reduction with tolerance?
If you have a lot of very small parts, it’s recommended to use model packages so
they can’t get lost in the build space. For that, select all the parts you want to join in
a package and move them close together. The press the button Create model package
in the Part menu or in the default mode in the bottom right corner.
In the Large Packing version, there’s also a Data-API to save and open packed
buildspaces in a network and an integration of an ERP System. Manuals and support
will be given individually.
5.7 Part Attributes
All parts have attributes which make them easier to organize in a netfabb project,
although they do not have a direct influences on their physical characteristics when
produced. These are the part’s name, color, group and number.
Rename Part
Parts in your project can be renamed via the context menu, which is opened
by a right-click on the respective part in the main screen or in the project tree,
or in the Part menu. Then, you can insert a new name.
Change Colors
The color can be changed for parts and slices. Right-click on them and choose
Change Color in the context menu or double-click on the colored dot next
to the part in the project tree. That dot always has the current color of the part.
Colors are always changed in a dialog box, which provides both predefined colors or
define your own colors (see chapter 10.2).
Groups
Groups of objects can be created in the context menu after right-clicking on
a part in the Parts section of the project tree. You can either just create a
new group or create a group with selected parts (figure 5.21). Parts can then be
added to the group or moved out of the group by drag drop within the project tree

PART ATTRIBUTES 75
(figure 5.22). This allows you to organize and structure the project. By clicking on a
group in the tree you select all parts in the group.
Figure 5.21: In the context menu of parts in the project tree you can create an empty
group or a group containing all selected parts.
If you right-click on the group in the tree, a context menu appears for editing the
group. You can rename groups, remove groups and all associated parts or, if you
have groups which do not contain any parts, you can remove all empty groups. If
you click on Ungroup, the group you clicked on is removed and the parts it contained
are moved into the superordinate group or the Parts section. (figure 5.22).
If you change the color of the group, all parts in the group and all parts you add to
the group get the same color. The icon of the group in the tree is updated so that the
sphere above the folder is displayed in the group color. If parts are moved out of the
group, they get back their old color.
If you Show or Hide a group, all parts in the group are shown or hidden. You can
also do that by clicking on the little eye next to the group in the tree. This eye also
indicates, if the parts of the group are shown or hidden. Whenever all parts in the
group are shown, the eye is orange. If all parts are hidden, it is grey. If some parts
are shown and some hidden, it is half orange and half grey (figure 5.22).

PART ATTRIBUTES 76
Figure 5.22: Left: Two groups in the project tree. Right: The context menu after
right-clicking on a group.
Part Numbers
If you right-click on the Parts section in the project tree, you can activate
or deactivate the option Show Part Numbers. If it is active, a number is
displayed next to each part in the project tree (figure 5.23).
Figure 5.23: Here, the numbers of the parts are shown in the project tree.
The first part in the project has the number 1. To each additional part, the next
number is assigned, even if parts with lower numbers have already been removed.
Parts also count as new parts, if they are edited, for example if they are repaired.
The numbering of parts may help to keep an overview over projects containing many
parts. In the same context menu, you can also renumber all parts. If you do so, the
parts are given continuous numbers again, but still according to how long they have
been in the project. So, the oldest part remaining in the project will get the number
one, the second oldest the number 2, and so on.

PLATFORM OVERVIEW 77
5.8 Platform Overview
The platform overview can be obtained by pressing F5 or is available in the
Edit menu or in the toolbar. It displays a window with an overview of all parts
in the project, including part number (ID) status, length, width, height, volume, area,
number of triangles, edges and points of the parts.
Also, the total size, volume and area of the parts and the filling degree of the platform
are displayed (figure 5.24). If the box Selected Parts Only at the bottom of the
dialog is ticked, unselected parts are not listed.
This data can be exported and saved as a CSV file. In the bottom left of the dialog,
you tick a box to export only a list of the file names without any additional informa-tion.
Target directory and file name can be chosen in a browser window.
Figure 5.24: Information about the parts in the platform are provided in a dialog
box. They can be exported as .csv file.

NEW PLATFORM (PRO FEATURE) 78
5.9 New platform (Pro feature)
With a click on New platform you can add predefined machine platforms to
the project tree. (figure 5.25) This feature is available in the toolbar, then
choose the tabsheet default machines. The listed platforms contain the exact mea-surements
of actual machines types and allow you to pack multiple platforms at the
same time. Please see a detailed list in the machine library menu (figure 5.26). See
how to pack your parts in the most simple way and how netfabb can help you with
this in chapter 5.5.
Figure 5.25: A Stratasys Objet24 platform is displayed. It is listed in the project
tree, as well as two other platforms that were chosen before. You can jump between
the single previews and pack your parts.
You can also add new platforms and define their measurements yourself. Just open
the New platform dialog and stay in the tabsheet Custom machines. Enter a ma-chine
name and its details and choose if you want to add, remove or change this new
platform.

COLLISION DETECTION 79
Figure 5.26: Choose one of the predefined platforms
5.10 Collision Detection
The Collision Detection checks, if any two or more parts in the project touch
each other. If a collision is detected, the colliding sections of the parts are
marked yellow. The function can be accessed in the toolbar, in the Edit menu or
by pressing Ctrl+K. Users can choose a tolerance of 1mm or 2.5mm, defining the
raster size (figure 5.27). netfabb divides the whole three-dimensional space in raster
cells of that size. Each raster cell occupied by more than one part is then marked
yellow (figure 5.28). Thus, with a tolerance of 2.5mm, parts with a distance of up
to 2.5mm may be marked as colliding. However, while a bigger raster makes the
collision detection less precise, it saves calculation time.
Figure 5.27: Choose a tolerance of 1mm or 2.5mm.

Figure 5.28: Left: Collisions are marked yellow. Right: Zoom in to see the marked
raster cells.
5.10.1 Live Collision Detection (Pro feature)
For the Live Collision Detection, you can click on a button in the tabsheet to
activate it. netfabb then constantly checks your parts for collisions, which are
marked yellow in the screen. The raster size is always 1mm. A new tabsheet appears
with all options for the tool.
Operations in the viewing screen, such as the positioning and scaling of parts can be
conducted normally. As soon as two parts touch each other, the collision is marked
and a large red X is displayed in the tabsheet. As long as there is no collision, a green
check is displayed.
In the tabsheet you can change all settings for the collision detection and for the
positioning of parts (figure 5.29).
In the top left, there is a notice if a collision has been detected. To update the
collision detection, click on the button in the top right of the tabsheet. This will
activate a new calculation and a new highlighting of collisions in the viewing screen.
If you tick the box Auto-update, an update will be performed every time you move
of a part. If you tick the box Update drag drop, a live update is conducted
even during the positioning of the part with drag drop. This helps you to position
parts very precisely, but can result in long calculation times when complex parts
are handled. The required memory usage is specified at the bottom of the tabsheet.
The box Display collisions has to be ticked, if you want collisions to be visualized.
Again, you can save processing time by deselecting this box and ticking it only after

Figure 5.29: The tabsheet of the Live Collision Detection. Left, a collision has been
detected. Right, no collision has been detected.
certain working steps.
To the right of the red X or green check, eight arrow-buttons are available to move
selected parts by specific distances to the left, right, up, down, backwards and for-wards.
When you use these arrows to move parts, netfabb will always move the part
along one of the three axes. The axes are assigned to the arrow buttons depending on
the current perspective.

PART ANALYSIS 82
Chapter 6
Part Edit
Three-dimensional parts can be edited in various ways. Features include the analysis
of parts, simple part editing functions, such as mirroring, inverting and converting in
size according to the length units mm an inch and the conducting of simple cuts.
Furthermore, any number of parts can be merged to one part and any part consisting
of more than one shell can be split into equivalent parts. Also, new shells and offsets
can be created on the basis of existing objects, cutting planes can be defined freely
and parts can be unified, subtracted or an intersection of parts can be created with the
Boolean Operations Module.
Further part editing functions are part of the repair module (chapter 7.1). These are
features for which you have to work with the triangle mesh more specifically.
6.1 Part Analysis
For the analysis of a part you have five options. A standard analysis, an anal-ysis
of upskins and downskins, of the center of gravity, the wall thickness
and the analysis of the part’s shadow area. For users, who have purchased netfabb
Professional before version 4.7, only the standard analysis might be visible because
of license issues. In that case, please contact us at support@netfabb.com. You will
get a new license file to activate the two analysis options.
An analysis of a selected part can be obtained by a click on the analysis icon in the
toolbar, in the Extras menu or in the Extras submenu of the context menu of a part.
You get a submenu where you can choose from the three kinds of analyses.

PART ANALYSIS 83
The analysis opens a window in the tabsheet providing information on the part. The
content depends on which analysis you have chosen. Information on all of your
analyses is listed together (figure 6.1) In the project tree, a folder Part analysis is
added as subelement to the part. All analyses are added to that folder (figure 6.2).
You can add an indefinite number of analyses.
Figure 6.1: The analysis of parts is displayed in the tabsheet. Left: The standard
analysis. Right: The results of the upskin and downskin analysis and of the shadow
area analysis are below the standard analysis.
Figure 6.2: A group of analyses in the project tree.
You can remove single analyses with a double-click on the red X next to the analysis
in the project tree. If you want to remove the whole group of analyses, use the red

PART ANALYSIS 84
X next to the group Part Analysis or right click on it and remove it in the context
menu.
6.1.1 Standard Analysis
The standard analysis provides information on the position, size, volume and
area of a selected part, as well as its number of points, triangles, edges and
shells.
It provides information about potential damage to the part by showing the number of
holes, boundary edges, flipped triangles and bad edges, specifies the overall length
of boundary edges and checks, if the part is closed and orientable. Thus, you can find
out, if a part requires repair and which kind of repair it requires.
Additionally, the minimum, maximum and average value as well as the deviation are
calculated and specified for edges per point, triangles per edge, triangle quality and
edge length (figure 6.1).
6.1.2 Upskin and Downskin Analysis (Pro feature)
If you choose the analysis of up/downskins, you can identify the top and bot-tom
surfaces of your part. You find out precisely, which surface areas of your
part are below a certain angle in relation to the bottom plane of the platform (X-Y-plane).
All areas below this angle are either an upskin or a downskin, depending on
their orientation upwards or downwards.
This analysis can be very important, as, for example, some production methods have
a different quality for upskins and downskins and it may make sense to rotate parts
to minimize those areas.
In a dialog box, you can enter the settings for the up/downskin analysis. First, you
can tick boxes to analyze upskins, downskins or both.
To the right, enter the threshold angles. If you enter 0, only absolutely flat areas
will be defined as upskins and downskins. If you enter 90, everything between the
flat areas and horizontal planes are defined as upskins or downskins.
In the parameters, you can edit the minimum component size and choose to filter
small triangles:
The minimum component size determines how big the upskin or downskin areas
must be. Sometimes, it is possible that very small areas, for example single triangles,

PART ANALYSIS 85
Figure 6.3: The dialog box for the Upskin and Downskin Analysis.
are within the specified angle. If the size of connected upskin or downskin areas
is below the minimum component size, the areas are not classified as upskins or
downskins.
With filter small triangles, small triangles which are within an upskin or downskin
area, but which are not within the specified angle, are filtered and are still classified as
upskins or downskins. That way, wrongly oriented triangles, like greases or similar,
do not disrupt the upskins and downskins.
In the analyses screen, the main area of the part is grey, the upskins are blue and
the downskins are green (figure 6.4). In the tabsheet, you get a field for the analysis,
where, for both upskins and downskins, the angle, overall area and number of compo-nents
is specified and you get single fields for all upskin and downskin components,
in which their area is specified (figure 6.1).
You always get back to this particular upskin/downskin analysis, if you click on it in
the tree or in the tabsheet.
6.1.3 Center of gravity (Pro feature)
This analysis provides information on the position of the center of gravity. It
gives the exact axis values and the size of the whole model. It helps you to find
a good part alignment for later manufacturing and you can decide if the functionality
of the part is given. (figure 6.5)

PART ANALYSIS 86
Figure 6.4: Left: The upskin of this sphere is colored green, the downskin is colored
red. Right: This part has two upskin components.
Figure 6.5: The red dot symbolizes the center for gravity of the part.
6.1.4 Wall thickness (Pro feature)
In the analysis of wall thickness you can check if the part’s wall reaches your
and your machine’s requierments. First, determine the minimum value of the
Critial Wall thickness. All results that are lower this number will be colored red and
everything that’s higher will be colored green. (figure 6.6) Then you can define what
percentage of the part may be smaller than the just described number. With the next
two buttons, you can save and load your own standard settings. For example, if you

SIMPLE PART EDITING 87
need all your parts to have a wall thickness of at least 0.5mm, type that value in the
Critial Wall thickness and 0.0% in the Critial Surface. Then press Save as default
and you will be able to use those settings later.
Figure 6.6: see description
6.1.5 Shadow Area Analysis (Pro feature)
The Shadow Area analysis projects the volume of your part to the X-Y-plane.
You get a sort of shadow the part casts on the bottom plane of its outbox
(figure 6.7).
It calculates the surface area of that shadow and specifies it in the analysis tabsheet.
The shadow analysis is sorted below the upskin and downskin analysis.
The shadow area analyis can only be started, if you have a faultless triangle mesh
without any holes.
6.2 Simple Part Editing
Several simple part editing functions are available in the standard mode, including
inverting the orientation of parts, mirroring parts, converting the size of parts accord-ing
to length units, merging parts and separating the shells of a part. They apply to
selected parts and are available in the Extended submenu of the context menu of the
part(s) or in the Part menu (figure 6.8).

Figure 6.7: The shadow of this part is projected to the bottom plane.
Figure 6.8: The Extended submenu in the context menu.
6.2.1 Invert Part
All triangles of the last selected part are inverted, with the outside turned in-side
and the inside turned outside. Parts with a valid orientation thereby be-come
totally side-inverted and consequently get a negative volume (figure 6.9). In-verted
parts are made valid. The shape of an object is not changed by this process.
You can either replace the original part or keep both.
6.2.2 Mirror
The selected Part is mirrored across the Y-Z-plane in direction of the X-axis.
While the triangles of the new part have the same Y- and Z-coordinates as the
original, the X-coordinates are turned around in relation to the overall X-dimensions
of the part. Thus, the mirrored part has the same overall dimensions as the original,
but the shape is turned around (figure 6.10). It can either replace the old part or is
positioned next to it.

Figure 6.9: Valid and inverted cylinders. The inverted cylinder has regular specifi-cations,
but a negative volume.
Figure 6.10: Original and mirrored part
By rotation, it is possible to get the effect of mirroring a part across other planes too.
If you wish a part mirrored across the X-Z-plane, you have to rotate the mirrored
part by 180 around the X-axis. Accordingly, if you want a part mirrored across the
X-Y-plane, you have to rotate the mirrored part by 180 around the Y-axis.
6.2.3 Convert Units
This feature adapts the length values of all axes to the same values in another
unit, either from mm to inch or the other way round. Thereby, it scales the
selected parts equally in all three dimensions, effectively changing its size. For ex-ample,
by choosing Inches to mm, an object with a length, height and width of
100.00 mm will grow to 100.00 inches. Choosing mm to Inches, the conversion is
conducted the other way round, with parts with the size of 100.00 inches getting a
size of 100.00 mm.
This feature can be necessary, if files are saved without length units by other CAD

CREATE SHELL (PRIVATE/PRO FEATURE) 90
programs and the part is then loaded in the wrong unit.
6.2.4 Shells to Parts (Private/Pro feature
Selected parts consisting of more than one shell are divided into several parts,
with each shell becoming an own part (figure 6.11). The original parts can be
either replaced by the new parts or left in the project.
To check which parts consist of more than one shell, one look at the project tree is
enough. Parts with multiple shells have a little box on the top right of the color dot.
Figure 6.11: With Shells to Parts, the interior shell of a hollow part becomes an
own part and can be moved separately.
6.2.5 Merge Parts (Private/Pro feature)
At least two parts have to be selected for this function. Multiple selected parts
are unified to form one single part containing all shells of the original parts
(figure 6.12). The original parts can be either replaced by the new part or be left in
the project.
6.3 Create Shell (Private/Pro feature)
This feature is available in the Extras menu or in the Extras submenu of the
context menu of a part. It creates a new shell on the basis of the selected part.
Depending on the parameters you enter in the dialog box, you can create a hollow
part, an inner offset or an outer offset or a hollowing shell of the original, either as a
three-dimensional mesh or as a sliced part.

Figure 6.12: Four parts become one part with four shells.
The shell thickness determines the distance between the outer skin of the original
part and the new shell. Every point of the new shell will have that distance to the
original. That means that, for example, corners and edges are rounded off, when you
make an outer offset (figure 6.13).
Figure 6.13: The dialog box for creating shells
A hollow part is the original part combined with a hollowing shell inside (see also
Hollowing shell).
An inner offset of a part is a new, correctly oriented part within the original. Its
shape is based on the original part, only smaller, according to the shell thickness
(figure 6.14).
An outer offset creates a part based on the original with a specified distance of the
skins, only that it is exceeding the original in size, seemingly enclosing that part
(figure 6.15).
A hollowing shell is an inverted part based on the shape of the original part. It is

Figure 6.14: Inner offset (right) of a box
Figure 6.15: Outer offset (right) of a box
placed within the original part and has a negative volume (figure 6.16). By merging
the original and the new part, a hollow part can be created.
Figure 6.16: Cross section of a cylinder with hollowing shell inside

SIMPLE CUTTING 93
As output type you can either create a three-dimensional part or a slice file. The
creation of a slice requires much less calculation time.
If you create a part, you can set the accuracy of the new shell. A very low value
means that a finer triangle mesh may be created. This results in very precise offsets,
but requires longer calculation time, both for the creation and for further handling of
the part.
If the result is smoothed, the corners of the new shell are rounded off and a better
triangle mesh is created.
The Option Create Slice exports the respective object as a slice file and inserts it into
the Slices section of your project. Therefore, no triangle mesh has to be calculated.
You can edit the layersize, according to your needs, and the roundness of offsets
(figure 6.17).
If it is necessary for the offset to form a curve, the angle you specify for the roundness
is the maximum angle of two adjacent corner points of the offset, with the original
corner point as apex of the angle. Consequently, the offset curve becomes rounder
and more precise, if the maximum angle is reduced.
Figure 6.17: If you create a slice instead of a part, you can set output parameters
for layer thickness and roundness.
6.4 Simple Cutting
Simple cuts parallel to the main planes can be prepared in the standard interface,
as all options can be found in the tabsheet (figure 6.18). Parts can be cut in a
right angle across the X-, Y- and Z-axes at specific coordinates, with a cutting plane
parallel to the other two axes (figure 6.19). By clicking on Execute cut, the Free Cut
module is opened (chapter 6.5), with the same cutting plane in place. There, you
can adjust further settings and execute the cut. If you have set cutting lines across

SIMPLE CUTTING 94
more than one axis, you have to choose in a dialog which plane you want to insert.
The split parts resulting from the cut are treated as own, separate parts (figure 6.23).
Figure 6.18: Cutting options in the tabsheet
Figure 6.19: Cut across X-axis
The value of the axis, across which a cut shall be performed, can be set by a regulator
or by manual insertion of a value. Additionally, you can set cutting planes with the
mouse.
To set a cutting plane with the mouse, right-click on the orange box between the axis
letter and the regulation bar and choose Set cut in the context menu. After you click
on it, you can click on the part to set a cutting plane across the chosen axis, which
runs through the point you clicked on. If you hold the left mouse button, a transparent
plane is displayed as a preview. You can move it across the part by drag drop. The
plane is not inserted until you release the left mouse button (figure 6.20).

SIMPLE CUTTING 95
Figure 6.20: Left: Right-click on the orange box to set a cut with the mouse. Right:
If you hold the left mouse button, a transparent cutting plane is displayed as preview
to the cut. The plane moves across the part, if you move the mouse.
To illustrate and preview the result of a cut without actually performing it, all active
cutting lines are shown. With default settings, the cutting line across the X-axis is
red, the cutting line across the Y-axis is green and the cutting line across the Z-axis
is blue. After a right-click on the field between the axis letter and the regulation bar,
you can choose to show the corner points on the cutting line.
Figure 6.21: Visualized points on a cut
The buttons between the axis-letter and the regulation bar show you which compo-nents
of the cut can be seen in the viewing screen. By clicking on that buttons, you
can hide these components and show them again. The orange boxes to the left and
right represent the display of sections of parts with lower and higher coordinates than
the cut. Hiding these sections helps you to get an unobstructed view on the resulting
split parts. The yellow line in the middle controls the display of the cutting line. If

SIMPLE CUTTING 96
you click on it, it is hidden and shown again. A hidden cutting line is deactivated
and cannot be transferred to the Free Cut module. It is shown and activated again
automatically, if you change the coordinates for the axis.
These viewing functions can be combined freely and make the cutting function a
powerful viewing tool, as you can see cross sections and the interior of parts. For
example, you can scroll from top to bottom with the scroll bar of the Z-axis and hide
the top section to see the horizontal cross sections of the part (figure 6.22).
Figure 6.22: Cutting lines across all three axes with three different viewing options.
First, everything is displayed. Second, sections before the cut across the Y-axis and
after the cut across the Z-axis are hidden. Third, the cutting lines are hidden as well.
Figure 6.23: The resulting split parts of the cut above can be moved separately as
own parts.
Reset sets back all cutting coordinates to zero and hides potential cutting lines. In
the context menu of the axes (after right-clicking between the axis letter and the
regulation bar) you can reset the cutting lines of single axes.
Cuts can be performed either for all parts or only for selected parts. Thus, all parts of

FREE CUT PRIVATE/PRO FEATURE 97
a project could be affected by a cut. The setting you choose in this dropdown menu
is adapted automatically in the Free Cut module.
After performing a cut, the cutting line of the axis which was selected for the cut is
set back, the others remain. So, if you want to perform cuts across more than one
axis, you can repeat the cutting process without the necessity of setting the second
and third cutting line one by one. That way, one part is dissected into up to eight
parts (figure 6.23).
6.5 Free Cut Private/Pro feature
With the free cutting tool, you can not only cut parts along the main planes.
You can define a cutting plane individually and then cut parts along this plane,
or you can draw a polygon on your screen which will be used as a cutting line.
The tool can be started by an icon in the toolbar, in the Extras menu or in the Extras
submenu of the context menu. The functions for the Free Cut can be activated in the
tabsheet. If you have already worked with the tool in this session, the last cutting
plane is still in position. If you have set a cutting plane with the simple cutting tool
and start the free cut there, this plane will be in place when you start the Free Cut.
With the two registers in the tabsheet, you can choose if you want to cut with a plane
or draw a polygon.
6.5.1 Free Cut with a Cutting Plane
First Placing of the Cutting Plane
To insert a cutting plane, you have three options: at a right angle to the skin of a part,
tangentially along the skin of a part, or defined by clicking on three points on the
part. The cutting plane is, by default, bright blue and has points in its center, at its
corners and in the center of its edges (figure 6.24).
When placing the plane, you can hold the left mouse button to get a preview of the
plane. The plane is inserted when you release the button. The size of the plane
is adjusted to the current screen, depending on zoom and perspective. Cuts can be
performed by clicking on the Cut button at the bottom of the tabsheet.
The three options can be activated by icons in the tabsheet:

Figure 6.24: Here, the cutting plane cuts through two parts, of which one is selected.
The cylinder is unaffected.
Create Cutting Plane Vertical to Surface: If this option is chosen, you can
insert a cutting plane with a mouse click on a part in the project. The cutting
plane will go vertically through the skin of the part at the point you clicked on and
will be positioned horizontally, if possible (figure 6.25).
Figure 6.25: Here, the cutting plane is inserted vertically to the sphere.

Create Cutting Plane Tangential to Surface: With this option, the cutting
plane is parallel to the triangle you click on and it runs right through that
triangle (figure 6.26).
Figure 6.26: This plane is aligned tangentially to the sphere’s skin.
Create Cutting Plane by Three Points: If this option is chosen, you can
click on any three points on the part. A cutting plane is inserted which is
defined by those three points. Here, you get the preview of the plane when you hold
the mouse button during the placing of the third point. The last point you choose will
also be the center of the plane (figure 6.27).
Move and Rotate Cutting Plane
With help of the points on the plane, you can move and rotate the plane with your
mouse per drag drop and you can change its proportions. Doing so, there is a
difference between the left and the right mouse button.
If you click on the center of the plane, you can move the whole plain freely. This
works in the same way as moving parts (figure 6.28). If you use the right mouse
button instead of the left, the plane can only be moved two-dimensionally to its sides.
It will still cut through parts in the same plane, but its boundaries change.
With the points on the edges and corners, the cutting plane is rotated. When you
move them by drag drop, two lines in a darker blue are displayed, one from the
point you are moving to the center of the plane, and one along the axis of rotation.

Figure 6.27: When you define a plane with three points, the first two are colored
blue, while the third is colored black and will be the center of the plane.
Figure 6.28: Use drag drop on the base point to move the whole cutting plane.
If you move the corner points, the plane is rotated around an axis vertical to the plane,
running though its center. Thus, the plane stays in the actual position, only its edges
and corners are moved. This is very important if you want to roll the plane afterwards
(figure 6.29).
The cutting plane can be rolled with the points in the middle of the plane’s edges.
The plane is always rotated round an axis parallel to the edge you clicked on, running
through the center of the plane. If you roll the cutting plane on all sides, you can
adjust it to any position (figure 6.30).
As you can rotate the plane only in two directions by using drag drop, it is often

Figure 6.29: With the corner points, the plane is rotated around a vertical axis.
Figure 6.30: With the side points, the plane can be rolled.
helpful to use the corner points first to rotate the plane around a vertical axis, so that
you can tilt it in the direction you want.
Change Size of Cutting Plane
If you use the right mouse button instead of the left, you can also change the size and
proportions of the cutting plane with drag drop. Use the side points and corner
points to enlarge and shrink the cutting plane.
Changing the size of the cutting plane is only relevant, if you cut with the option
Use Plane Boundary (see below).

Align Cutting Plane
Additionally, if you right-click on a part, a context menu is opened which gives you
further options for the positioning of the plane:
First, you can move the basepoint of the plane to the point you clicked on.
Thereby, the whole plane is moved parallel.
Second, you can move the plane parallel so that it goes through the point you
clicked on. This function is similar to the first, but the base point is moved
only in a right angle to the plane.
Third, you can align the plane parallel to the face you clicked on. The plane
is rotated into a parallel plane. To move the plane tangentially to a face, first
align the plane and then move the base point or move the plane parallel.
Fourth, if you click on an edge of the part, you can align the plane vertical to
this edge. Again, the plane is rotated, cutting in a right angle through the edge
you clicked on. However, it is not moved to the point you clicked on. Therefore, you
would have to follow up this option with one of the first two.
Information and Fine-Tuning
Alternatively to positioning the cutting plane in the screen, you can enter specific
values for the plane in the tabsheet, enabling you to fine-tune and position the plane
more precisely (figure 6.31):
The base point is the central point of the cutting plane. You can enter values for the
X-, Y- and Z-axis. The plane is then moved immediately.
Below, you can move the cutting plane into parallel planes by entering the distance
you want to move it and then clicking on + for moving the plane upwards in a
vertical direction or - for moving the plane downwards.
For the option move parallel you can enter a distance and click on + and - to
move the plane upwards and downwards in a right angle.
Below that, you can set specific angles for roll, pitch and yaw. The angles can either
be entered in the fields to the right or adjusted with the horizontal scroll bars.
Roll and pitch determine the rotation of the cutting plane, with roll representing the
rotation to the sides and pitch representing the rotation to the front and back. Yaw
determines the rotation of the plane around the vertical axis running through the
central point.

Figure 6.31: The tabsheet register for the free cut with a cutting plane enables you
to enter specific values, edit parameters for the cut and perform the cut.
Note: With a yaw of 90, the side edges are rotated as well, although no apparent
change can be seen. So, Roll and Pitch are exchanged, compared to when you
have a yaw of 0.
The size of the plane can be changed below, with two values to be entered for the
two axes of the plane. The base point of the plane stays in the same position.
6.5.2 Free Cut with a Polygon
After you click on the tabsheet register Polygon cut, you can draw a line on your
screen which will be projected through your parts when you perform the cut (fig-ure
6.32).
The first two buttons in the tabsheet determine in which mode you are. In
the first mode you can create and edit your polygon. With left-clicks on the
screen you set corner points for the cutting line. With default color settings, the
points appear as yellow squares and the cutting line is blue. When you set the third
corner point, the first and the last point are connected so that the cutting line becomes
a triangle. Further corner points make it a polygon. The corner points you add are

Figure 6.32: The tabsheet options for the Free Cut with a polygon.
always connected to the two corner points attached to the closest line. For a clear
preview on the cut, the section which will be cut out is colored grey. With the scroll
bar in the tabsheet box View, you can edit the Transparency of that preview. If you
move the slider to the right, the preview gets more and more transparent and at the
end vanishes (figure 6.33, 6.34, 6.35).
Figure 6.33: Left: Set corner points for a polygon with simple mouse-clicks. Center:
After changing the perspective you get a good preview of the cut. Right: The two
parts after performing the cut (Triangulate Cut is activated).

If you change the perspective after setting the first corner points, you can look
at the cutting section from different angles. The cutting line is not rotated with
the perspective. With the button Reset perspective to cutting direction you can set
the perspective back to the one you had when you started setting cutting points.
To change the shape of the cutting line, you can move the points by drag drop.
The points are always moved sideways and never up and down (as the cutting line is
projected through the whole area where it meets parts anyway). So, when you have
changed the perspective, the shift can be a bit different to what you would expect
intuitively. Rotate the perspective with the right mouse button to understand how the
cutting line has been changed.
After right-clicking on a corner point of the polygon, you can remove that point in
the context menu.
When you click on Cut, the cutting line is projected through your parts. Everything
within that projection is then cut out of your parts. The direction of the projection
corresponds to the perspective from which you were looking at the project when you
started drawing the line (figure 6.33, 6.34). You automatically leave the Free Cut
module.
By clicking on the second button in the tabsheet, you switch your mode to
Select parts. With that mode activated, you are no longer able to edit your
cutting line. Instead, all options of the standard interface become available. You
select parts by clicking on them and you can move and rotate them by drag drop.
Also, all context menus of the standard interface are available.
With Reset in the tabsheet you can remove your polygon and start a new line.
You automatically get back into the mode Create/Edit polygon.
In the borders tab below (figure 6.36), you can add tolerance spacing to the cut.
This means that additional space between the two resulting cuts will also be cut off,
which gives clearance to the parts. If you use a 3D printing technology, where the
contours swell up at little, this is very helpful.
Activate the tolerance spacing with a check mark first, then define its thickness. You
can choose if you want the space to be added inside, outside or on both sides of the
original cutting line.
With a check mark on create round corners, the corners of the polygon will be
smoothed. The value next to it defines the radius of this rounding.

Figure 6.34: Left: Here, the cutting line divides parts into three sections. Center:
The cutting line projects through several parts. Right: The option only selected
parts is activated. All other parts are not affected.
Figure 6.35: The same cutting section as in figure 6.34, with medium transparency.
In the information tab (figure 6.37), there is an information box which specifies the
number of points of your polygon and the volume of the whole cutting section which

Figure 6.36: Define clearance between the parts cut off parts and set the radius of
rounded edges.
is about to be cut out of your parts.
Figure 6.37: The polygon’s information.
Figure 6.38: Left: A polygon cut with a 6.000 mm tolerance space on the inside and
a 5.000 mm corner rounding. Right: The cut part.

6.5.3 Cutting Options
In the bottom third of both tabsheet registers, there are four boxes representing op-tions
for the cut itself. By ticking or unticking these boxes, you can activate and
deactivate the options.
You can cut only selected parts or all parts, through which the cutting plane or line
runs. Selection options are the same as in the standard module.
When you use the plane boundary, the cut is only conducted as far as the outer
edges of the plane go. If the box is not ticked, the parts are cut completely through
along the plane, independently from the size of the displayed cutting plane. This
option can only be chosen for cuts with a cutting plane.
If you Stitch parts, open triangle edges are connected. Sometimes, if the option
Triangulate Cut (see below) is activated, the cutting tool produces open edges (for
example if a part has self-intersections) which can be connected with this additional
step.
Next, you can choose to Remove the original parts and replace them by the cut
parts. If you do not remove them, they are hidden after the cut.
If you triangulate the cut, holes that emerge at the new cut parts are closed automat-ically
with a straight surface across the cut. If not, the parts will be open (figure 6.39).
Figure 6.39: Non-triangulated (left) and triangulated (right) cut of a box.
With the option Create group, the cut parts are moved into a new group in the project
tree.
Finally, at the bottom of the tabsheet, you can either Cut to perform the cutting with
the chosen plane and settings. The cut parts are then inserted into a group in the
project tree. You can also cancel the cutting and leave the cutting tool without doing

BOOLEAN OPERATIONS (PRIVATE/PRO FEATURE) 109
anything. You can go back to the tool any time. The cutting plane remains in place.
6.6 Boolean Operations (Private/Pro feature)
The Boolean operations module creates either a unification or a cross section
of two or more overlapping parts, or subtracts one overlapping part from the
other, effectively cutting the cross section out of the remaining part. They can only
be preformed with closed and oriented volume meshes and will always result in new
parts.
To conduct Boolean operations, first move parts together so that they overlap, then
select all parts you want to use. Start the Boolean Operations module in the toolbar,
in the Extras menu or in the Extras submenu of the context menu. This opens a new
screen and options for Boolean operations in the tabsheet. The screen includes only
the selected parts.
In the tabsheet (figure 6.40), the parts are listed in two fields. Parts which shall
remain after the Boolean operation are marked green in the screen and are listed in
the left field. Parts that shall be subtracted from the resulting part of the Boolean
operation are marked red and listed in the right field.
This basic setting for a part is changed either by clicking on the part in the screen or
by selecting the part in the tabsheet and clicking on the arrow below the field. The
color of the part will be changed and it will be moved into the other parts field in the
tabsheet.
The Log field in the tabsheet shows the result of a test, if the parts prepared for
Boolean operations are closed and oriented. The test is conducted every time you
start the Boolean Operations module. If one of the selected parts fails this test, no
Boolean operations can be conducted.
Depending of how you have assigned your parts, three major Boolean operations
can be conducted, based on position and volume of the different parts: Parts can be
unified, an intersection of parts can be created and parts can be subtracted from
one another. Thereby, the triangle meshes of the parts are retriangulated, resulting
in new, closed and oriented volume triangle meshes. The operations are available
in the Actions section at the bottom of the tabsheet and in the context menu by
right-clicking on the screen.

Figure 6.40: The tabsheet for conducting Boolean operations
Unify Parts
To enable this operation, all parts must be green. Effectively, it unifies all
parts of the operation, removing all resulting intersections and interior sur-faces
and triangles (figure 6.41).
Figure 6.41: Left: Two parts before the Boolean operation. Center: A preview of the
unification in the Boolean Operations screen. Right: The resulting part.
Create Intersection

All parts are required to be green for this operation. The new part created
by this feature includes only the cross section of the volumes of two or more
parts. The triangle mesh is created around this common volume (figure 6.42).
Figure 6.42: An intersection of a box and a cylinder
Subtract Parts
For this function, at least one part must be marked red and situated in the right
Parts field. A new part is then created as a unification of all green parts,
but with all cross sections with overlapping red parts being cut out (figure 6.43).
Figure 6.43: Red parts are subtracted from the green parts.
Settings
Further settings in the tabsheet are Remove Original Parts and Remove Degener-ate
Faces and Filter Noise Shells:
If Remove Original Parts is ticked in the tabsheet and a Boolean operation is ap-plied,
the old parts will be removed. If it is not ticked, you will have both the old and
new parts available.

LABELING (PRIVATE/PRO FEATURE) 112
After the retriangulations, Remove Degenerate Faces, if ticked, removes all trian-gles
without any or with hardly any surface. These triangles usually are unnecessary.
By setting the tolerance, you can set the maximum height of the triangles which shall
be deleted.
Finally, you can Filter Noise Shells. These are very tiny shells which can come into
being when you subtract parts or create intersections. If the box is ticked, you can
enter a tolerance volume. All shells with a volume lower than that will be deleted
when the Boolean operation is applied.
Apply Boolean Operations
After performing one of these operations, you can either apply the calculation, undo
the calculation or thoroughly cancel Boolean Operations (figure 6.44). If you want
to insert the part into the project, you have to click Apply. If you want to perform a
different Boolean Operation, click Undo. To leave the module without effect, click
Cancel
Figure 6.44: Apply, undo or cancel Boolean operation.
6.7 Labeling (Private/Pro feature)
With the labeling module, you can merge texts or images on parts easily. To
begin, select the part and click on New part labeling. It is available via the
button New part labeling in the toolbar and in den context menu - Extras. In the new
menu, you can choose between New text labeling (flat) and New image labeling.
Text labeling
Choose New text labeling (flat) to merge a text or numbers in your part. In the
labeling module, you see that the view in the project tree has changed. With a right-click
on the laben (first called empty text) a menu pops up where you can remove

the labeling, make a new one or duplicate an existing one. So if you like to give your
part more then one label, you can start new text via this menu (figure 6.45).
Figure 6.45: The project tree of the labling module. Make quantity changes in the
context menu.
To enter a text, click on the white field next to Caption in the tabsheet. (figure 6.46)
Letters, numbers and special characters are possible. Now click on the model to view
the text on the part (figure 6.47).
In the tabsheet, you can change the font parameters with the ...-button, then define
the height, width and depth below. It’s also possible to adjust height and width by
dragging the label’s blue outlines with the mouse. Rotate the part by with dragging
the little grey boxes. Then choose the build type: Add parts will make the label
stand out of the model, substract from part will engrave it. You can also use inverted
texts, which is usefull for creating molds for example (figure 6.48). Press Apply to
finally label the part.
Image labeling
With a click on the white field that says no image in the tabsheet you can choose
an image (figure 6.49). netfabb can read BMP, PNG and JPEG files - they work best
when they are black/white only. If you have grey or color pictures, adjust the grey
level with the threshold bar below. Now click on the model to view the image on the
part (figure 6.50).
In the tabsheet, define the height, width and depth of the image. It’s also possible to
adjust height and width by dragging the label’s blue outlines with the mouse. Rotate
the part by with dragging the little grey boxes. Then choose the build type: Add

Figure 6.46: Enter the label text in the Caption field, then adjust the parameters
below.
Figure 6.47: The preview of the labeled box. Change the size by dragging the blue
lines, for rotating, drag the grey boxes.

Figure 6.48: Left: an added label. Right: an edited, substracted and inverted label.
Figure 6.49: Choose an image with a click on no image and adjust the grey scale
threshold.
parts will make the label stand out of the model, substract from part will engrave

Figure 6.50: The preview of the labeled box. Change the size by dragging the blue
lines, for rotating, drag the grey boxes.
it. You can also use inverted texts, which is usefull for creating molds for example
(figure 6.51). Press Apply to finally label the part.
Figure 6.51: Left: an added label. Right: substracted and inverted label.

MESH SMOOTHING (PRIVATE/PRO FEATURE) 117
6.8 Triangle Reduction (Private/Pro feature)
This feature can be found in the Extras menu in the Mesh manipuation section
or in the context menu after right-clicking on the part and choosing Extras. It
is also available in a reduced version in the Repair mode (see 7.7.2). In the triangle
reduction, netfabb unifies triangles to create bigger ones. Its benefit is to reduce the
file size and speed up the workflow.
When you start the function, a frame appears on the lower right corner with the tabs
Triangle reduction and Smoothing. You can see the number of triangles the
original part has and - as soon as you calculate any changes - how many triangles the
part will have.
In the Settings below, reduce the triangle count to a maximum deformation repre-sents
the maximum change in the surface of the part. The maximum edge length
determines the maximum length of edges which are unified. Please note that wrong
condition settings, for example extremely high values, may lead to unsatisfying re-sults,
such as strong distortion or self-intersections. You can choose the Fast mode,
which works faster but a little less accurate. Show a preview of the reduction by
clicking on Calculate and if you want to get back to the original mesh, press Re-set.
In the Display options you can make the mesh visible (Show triangles) and by press-ing
and holding the Show original mesh button you’ll get to review the triangulation
before you reduced it. With a check in the Autoupdate-box, all the changes you
make will be displayed on the model immediately. This is very useful for checking
the new mesh with every change, but can lead to long calcuation times when working
with complex files. If you always want to use the same reduction settings on all your
models, click on Save settings to make them available later. Apply your calculations
by pressing OK.
6.9 Mesh Smoothing (Private/Pro feature)
This function smooths rough surfaces and rounds off sharp edges. It can be
found in the Extras menu in the Mesh manipuation section or in the context
menu after right-clicking on the part and choosing Extras. It is also available in a
reduced version in the Repair mode (see chapter 7.7.2).

MESH SMOOTHING (PRIVATE/PRO FEATURE) 118
Figure 6.52: Up: The original mesh, Down: Reduced triangles
When you start the function, the Smoothing frame will appear in the lower right cor-ner
where you can determine the strength of the smoothing. An interation means how
often you want to repeat the smoothing process. With every iteration, the following
process takes place: For each corner point of the triangle mesh, the average position

REMESH (PRIVATE/PRO FEATURE) 119
of the adjacent corner points is calculated. The position of the first corner point is
then adjusted to this average value. That way, surfaces become smoother and corners
and sharp edges of objects become rounder and are pulled inwards.
Prevent shrinking: The part will be deformed but the volume won’t get any smaller.
Independent of triangulation: The smoothing doesn’t happen on the basis of the
triangle mesh but of the actual part shape. This way, you hardly get any deformation
effect. Striking edges will be retained, less rough surfaces will be smoothed. To
have a more regular triangle mesh and improve smoothing, you can refine the mesh
and reduce the max. edge length. Show a preview of the smoothing by clicking on
Calculate and if you want to get back to the original mesh, press Reset.
In the Display options you can make the mesh visible (Show triangles) and by press-ing
and holding the Show original mesh button you’ll get to review the triangulation
before you smoothed it. With a check in the Autoupdate-box, all the changes you
make will be displayed on the model immediately. This is very useful for checking
the new mesh with every change, but can lead to long calcuation times when working
with complex files. If you always want to use the same reduction settings on all your
models, click on Save settings to make them available later. Apply your calculations
by pressing OK.
6.10 Remesh (Private/Pro feature)
If your part has a very irregular mesh, you can remesh the triangles and get a
smoother shape. This is very helpful for scans and organic shapes. The feature
is available in the Extras Menu in the Mesh manipuation section. First, choose the
resolution the new mesh should have (figure 6.54). The lower this value is, the more
similar the result will be to the existing part and the finer the triangle mesh will be.
As the value becomes bigger, the simpler the surface will be. (figure 6.55)
In the Display options you can make the mesh visible (with Show triangles) and
by pressing and holding the Show original mesh button you will get to review the
triangulation before you remeshed it. With a check in the Autoupdate-box, all the
changes you make will be displayed on the model immediately. This is very useful
for checking the new mesh with every change, but can lead to long calcuation times
when working with complex files. If you always want to use the same reduction
settings on all your models, click on Save settings to make them available later.

Figure 6.53: Up: The original mesh, Down: Smoothed triangle mesh.
Apply your calculations by pressing OK.

Figure 6.54: If the quality of the mesh is unsatisfying, especially with organic shapes
or scans, remesh the model: The higher the resolution, the stronger all irregularities
will be sorted out.
Figure 6.55: The scan after remeshing by 0.95 mm (Fast mode unchecked) with an
improved surface quality.

COMPARE TWO MESHES (PRIVATE/PRO FEATURE) 122
6.11 Compare two meshes (Private/Pro feature)
The mesh compare feature is available in the Extras menu Compare two
meshes or also with the button Keep and compare in the dialog that pops up af-ter
you have applied a repair (see chapter 7.1). In this feature, you can compare two
similar models (after you have edited or fixed them) for their differences and find out
if they lie within your tolerances. These will be made visible in terms of colours and
numbers. First, select two parts that you want to compare. They need to be located
on the exact same geometrical position in netfabb (figure 6.56). The most simple
way to do this is to move them both to the origin (see chapter 5.5.1) or to keep the
original part after editing or repairing it (see chapter 7.1).
Figure 6.56: Parts that shall be compared must have the same position, like these
two bricks: the original blue part and the changed purple part.
When you choose the compare feature, a dialog opens where you can choose which
parts you want to analyse. If you have selected two parts before, then they are prese-lected
in this dialog. Decide which part you want to examine: The Comparison part
is usually the new, changed file. Then click on compare (figure 6.57).
The reference part will be colored green/red. If you choose the Comparison part in
the tabsheet on the right, it will be colored green/blue. Blue/red marked areas have
a comparetivley large distance to the respective areas on the other part: there are the
most significant differences (figure 6.59). In the tabsheet the exact numbers of the
differences are listed: from the minimum, average and maximum distances you can
see if the changes are within your tolerance limits (figure 6.62).
For visualization, you can choose from which threshold on you want the areas to be
marked red/blue: You can define what differences are acceptable for you and only

Figure 6.57: In the compare module: Select in this dialog, which model should be
checked for changes. The differences will be made visible on the comparison part.
Figure 6.58: See the minimum, average and maximum distance in this tabsheet and
check if the differences are within your tolerance limits.
mark red/blue what’s above this value (figure 6.60).
In the visualization you can choose if you want to show a color gradient and a triangle
mesh, if you want to highlight the edges where the distance to the original shape is
most striking or show the part transparent to get a better view of inner surfaces. In the
second tabsheet Bar chart you find listed, how many areas of a part have a specific
distance to the original part. So one bar stands for a distance and the bar’s height
displays, how often this distance occures.

Figure 6.59: Left: On the comparison part the most significant differences are
marked blue. Right: On the Reference parts, these areas are marked red.
Figure 6.60: Make visualization changes in the tabsheet. You also see the minimum,
average and maximum distance.
Figure 6.61: Left: A very low value as threshold. Right: With a higher value, smaller
differences on the part remain green and are marked as acceptable.

WINDOWS
R KINECT
R - SCAN TO NETFABB 125
Figure 6.62: The bar chart visualizes how often a specific strength of change occures
in the two parts.
6.12 Windows
R Kinect
R - scan to netfabb
If you own aWindows
R Kinect
R , you can connect it and directly scan objects
to netfabb. The Kinect module is available in the Extras menu. Define in the tabsheet
on the right the parameters for your scan:
Figure 6.63: Define the scanning parameters.
The voxel resolution determines
how many points of a certain vol-ume
are scanned.
According to this, define the vol-ume
size: how large is the imagi-nary
box that you want to scan?
You can scan in two different
modes. DepthFloat: higher qual-ity,
but needs more processing
power. Point Cloud: lower qual-ity,
but requires less processing
power and works more stable.
Choose wether you want to in-tegrate
color information aswell.
The triangles will be colored and
the mesh will save this informa-tion.
The sensor tilt defines the scanning height.
If you want to repeat a scanning process, simply click on Volume reset and start over.

TEXTURE AND COLOR MESH (PRIVATE/PRO FEATURE) 126
As soon as you’re happy with the result, choose Create mesh to load the model into
the netfabb default mode.
Figure 6.64: A screenshot during the scanning process with a medium resolution
and no color integration.
6.13 Texture and color mesh (Private/Pro feature)
This module enables you to add colors and textures to your parts. That way,
you can mark different shells for machine specific manufacturing, simulate later
painting or simply send the parts to a printer / service that can print real colors.
The feature is available in the Extras menu. (figure 6.65)
If your parts contains textures already, they are listed in the tabsheet on the right.
Below, you find the display options where you can show the triangle mesh, textures,
colors and display the part transparent. (figure 6.66) In the toolbar, there are six new
icons. The first four functions are for coloring, the last two for texturing. (figure 6.67)

Figure 6.65: The color and texture module displays the existing colors and enables
you to change, improve, and add them.
6.13.1 Coloring
The screenshot below shows a part that already contains color information but it
needs to be improved. When you click on one of the coloring icons you switch
directly to the colors tabsheet where you can choose a color (figure 6.68). If you
want to delete all colors, just use the white to overlay them or delete them in the
Mesh viewer (see chapter 4.4). As mentioned above, there are four icons in the
toolbar for coloring a part:
The pipette allows you to read a color from a specific triangle. This way, you
can use the colors that already exist on the part.
With Paint on triangles you can add a color to single triangles. First choose a
color in the tabsheet on the right and then click on a triangle. By holding the mouse,
you can paint more than one triangle at a time. (figure 6.69)
Paint on surface enables you to color larger areas. It works like a pen in any
graphic programs. (figure 6.70) In the tabsheet you can decrease or increase the
radius to change the size of the pen. (figure 6.71) The selection tolerance determines
what area may be colored: the smaller the radius is, the less triangles will be colored

Figure 6.66: In the textures tabsheet, all pictures are listed and display options can
be changed.
Figure 6.67: The coloring / texturing icons in the toolbar.
and the other way round. (figure 6.72)
If you want to color a complete mesh, choose Paint on shells and click on the
regarding shell. (figure 6.73)
6.13.2 Texturing
You can also use image files and cling them to your parts. Therefore, use the two
texturing buttons in the toolbar.
Project texture
In the Project texture mode, you see a preview of the texture and a new tab-sheet.
Choose in the tabsheet how the texture should be placed on the part. (fig-ure
6.74) Either simply projected, wrapped around the model like a cylinder or like

Figure 6.68: The coloring tabsheet.
Figure 6.69: Left: A few colored triangles are missing. Right: The part was im-proved
by coloring single triangles.
a sphere. (figure 6.75)
Projector, cylinder and sphere
In the texture projection box, choose an image file. There you can also set a check-mark
if you want to texture the surface that’s facing to you or also the backside. The
preview plane will then display the image and you can scale, rotate and place it by
using the blue dots or enter exact values in the tabsheet. (figure 6.78)

Figure 6.70: Left: Coloring a part with a pen in the Paint on surfaces mode.
Figure 6.71: The settings tab for the coloring mode. Adjust color and size of the
coloring pen here.
If you want the image not only to be used once but to be repeated on the whole
surface, check the repeat texture box. To apply the texture, click on project.
6.13.3 Add advanced texture (Pro feature)

Figure 6.72: Left: A selection tolerance below 90. Right: Here’s the tolerance
above 90 and the pen now also covers the ancient side of the box.
Figure 6.73: One complete shell colored with the Paint on shell mode.
Figure 6.74: Preview of texture and the texturing tabsheet.
In the advanced mode, you can cut out which specific area of a part you want
to texture and also which specific area of the image you want to use.

Figure 6.75: Left: projector, middle: cylinder, right: sphere.
Figure 6.76: Left: the part with a preview of the texturing plane, middle: a preview
of the texture, right: the textured part.
of the texture, right: the textured part..
First, choose an image in the texture field in the tabsheet. Then begin with defining
the textured area. You can do this with a few clicks on the part. Then define the
texturing area in the picture. (figure 6.79) For each click, blue dots on the part and in
the grid will appear. By dragging these dots you can define this area more precisely.
With a rightclick on the dots you can delete or reset the points.

of the texture, right: the textured part.
Figure 6.79: Left: Define the area on the model that should be labeled. Middle:
Then define the according area in the picture. Right: Preview of the labeling.
This mode works similar to the projector mode, with one difference: The advanced
mode wraps the image also in undercuts; the projector doesnt. (figure 6.80)
Figure 6.80: Two pictures on the left: Part textured in the project mode. Two pictures
on the right: In the advanced mode, also the undercuts are textured.

THE REPAIR MODULE 134
Chapter 7
Part Repair (partially Private/Pro
feature)
7.1 The Repair Module
Whenever any part is damaged and therefore cannot be used for 3D printing, a
large warning sign with an exclamation mark is displayed in the bottom right of the
viewing screen, and a little warning sign is placed next to the part in the project tree
(figure 7.1). Before building these parts, they must be repaired.
The fastest way to repair one or several parts is to select them and click on the
shortcut icon Automatic part repair in the tabsheet on the right. A dialog
opens where you can choose between three predefined repair macros (see chapter 7.6
for more information on the single scripts.) You can either use these predefined
macros or define your own ones (e.g. with an automatic scaling or naming of parts -
see chapter 7.6 also). Like this, you can automatize and speed up your processes.
For a more controlled repair, select a part and start the repair module with
the red cross icon in toolbar, in the Extras submenu of the context menu or
in the Extras menu in the menu bar.
The viewing screen then switches to the repair screen, which includes only the
selected part. In the tabsheet, you can choose from five registers, Status, Actions,
Repair scripts, Shells and View. In the menu bar, the menus Repair and Mesh

THE REPAIR MODULE 135
Figure 7.1: Left: This caution sign in the bottom right of the screen indicates that
one or more parts in the project are damaged. Right: The warning signs indicate
that parts 3 and 4 are damaged.
Edit are added. In the project tree, the repair is integrated as subordinate element
of the part. After conducting other operations, you can return to the repair any time
by selecting the repair in the project tree. You can also add other parts to the repair
module by drag drop in the project tree. That way, you can repair several parts at
once.
With the repair module you can repair your files automatically, semi-automatically
or manually by flipping inverted triangles, closing holes, calculating and removing
self-intersections, stitching triangles and removing double faces and degenerated tri-angles.
netfabb Professional also offers features to edit the triangle mesh: You can
cut surfaces, extrude surfaces or edges, reduce the number of triangles and refine and
smooth your mesh.
In the Status register of the tabsheet, statistics are provided concerning the state of
and the damage to the part. It includes the number of edges, border edges, overall
triangles, triangles with invalid orientation, shells and holes. After performing a
working step on the part, the statistics can be updated by a button. By selecting
auto-update, the statistics are constantly monitored and updated (figure 7.2).
When you are finished with your repair operations, the repaired object is inserted into
the project by clicking on the Apply button in the tabsheet, by double-clicking on
the green tick next to the repair in the project tree or in the context menu after right-clicking
on the repair. On request, you can either Remove old part (the original part
will be deleted and replaced by the new repaired part), keep old part (the original part
will remain and the repaired part will be copied), keep and compare (see chapter 6.11)
or cancel (figure 7.3).

REPAIR VIEWING OPTIONS 136
Figure 7.2: Information about the properties and damages of the part are given in
the tabsheet.
Figure 7.3: Apply the repair and choose if you want to delete or keep the old part
- the repaired part will then be copied into the platform. You can also compare the
two meshes (see chapter 6.11).
With the Undo-function in the Edit menu, you can go back to different stages
of your repair. With Redo, you can perform the process you have undone
again.
Repair functions are available in the tabsheet, in the Repair and Mesh Edit menus
in the menu bar and in context menus, depending on where you right-click on the
screen.
7.2 Repair Viewing Options
The viewing options in general are very similar to those in the normal interface. All
perspective settings and the zoom functions with the mouse are identical (chapter 4).

7.2.1 Zoom and visualization
The default zooming options are replaced, as there is only one part on the screen and
single triangles can be selected. They are:
Zoom on Part: The part is moved into the center of the screen and the zoom
is reset so that the part is adjusted to the edges of the screen.
Zoom on Selected Triangles: The zoom is reset so that selected triangles are
in the center of the screen and these triangles fit exactly into the frame of the
viewing screen.
Zoom to Selection: This feature enables you to drag a selection rectangle
when holding the left mouse button. netfabb then zooms in to that selection.
By ticking the respective boxes in the visualization settings in the Status register,
you can choose whether to highlight holes with a yellow line, show degenerated
faces, visualize the triangle mesh and highlight errors with a thicker line. Errors can
also be highlighted during operations by holding the H-key (figure 7.4).
Figure 7.4: The visualization settings in the tabsheet
If the triangle mesh is not shown, there is the option to visualize triangle edges ex-ceeding
a certain angle which can be adjusted with a slider. Here, 0 stands for
triangles lying in the same plane and all angled edges are shown, while with 180
(or off), no edges are visualized (figure 7.5). The setting of this regulator also has an
influence on the selection of surfaces (see chapter 7.3).
7.2.2 Inner view (Private/Pro feature)
In the tab View, you can now take a look inside the part. This is very helpfull if you
need to repair a mesh which is hidden in or behind another shell and which you can’t
reach from outside. If your model contains texture information, tick the box Show
textures to make them visible. The next check box turns the whole part transparent

Figure 7.5: One part with four different options for the visualization of edges. First
the triangle mesh is shown (all edges), then it is switched off and all angled edges
(Setting 0), all edges exceeding 20 and no edges are visualized (180/off).
and you can see every shell the model contains. The scroll bars below are the actual
viewing tool: move a bar until you see an outline on the model and click on one half
of the little orange box on the left side of the bar. (figure 7.6) The model will be
opened and you can now edit and repair the interior parts of the file. (For further
explanations see chapter 6.4.) A click on the box Transparent Cuts hides or shows
the cut off part.
Figure 7.6: With the tab View you can take a look inside the part. Open the part
with the cutting bars and can not only view the inside but also work on inner shells.

SELECTION 139
7.3 Selection
Basic Selection
For the repair module, there are several selection options. Depend-ing
on the chosen selection mode, either single triangles, all trian-gles
of surfaces or all triangles of shells can be selected with a mouse click (fig-ure
7.7). With default settings, selected triangles are colored green on the outside
and darker green on the inside, while unselected triangles are colored blue on the
outside and red on the inside.
Figure 7.7: Left: Selected Triangles. Center: A selected surface. Right: A selected
shell.
If the Ctrl key is held, triangles, surfaces or shells can be deselected or added to the
selection with a mouse click. If both the Ctrl key and the left mouse button are held,
all triangles, surfaces or shells crossed by the mouse cursor are either added to or
removed from the selection, depending on whether you first click on a selected or
on an unselected triangle. Holding the Shift key instead of Ctrl works similarly, but
only for adding to the selection.
Alternatively to selecting with simple mouse clicks, single triangles, surfaces or
shells can also be selected in the context menu without changing the selection mode.
If you are selecting single triangles or even using one of the manual repair modes (see
chapter 7.4), you can select a whole shell by right-clicking on it and choosing Select
this Shell in the context menu. The same goes for triangles and surfaces.
After activating the mode selection rectangle in the toolbar, you can select
all triangles within a frame by holding the left mouse button and dragging a
rectangle (figure 7.8). Choose between the four different modes of selecting:

SELECTION 140
Select all triangles: All triangles that lie within the rectangle, no matter if they are
at the backside of the part or covered by another surface, will be selected.
Select front-facing triangles only: Triangles, that face to the front will be selected,
even if they are covered by other surfaces.
Select uncovered triangles only: Triangles, that face to the front or back and that
are not covered by other surfaces will be selected.
Select front-facing and uncovered triangles only: Only those triangles that you
can actually see from your current perspective and are facing to you will be selected.
Figure 7.8: Left: Drag a rectangle with the mouse. Right: The resulting selection.
Additionally, there are three default selections available in the tool-bar
or in the part’s context menu. They select either all triangles,
toggle the selection, which means that selected triangles are deselected and dese-lected
triangles are selected at the same time, or clear the selection, with all triangles
becoming deselected.
Surface Selection Parameters
The selection of surfaces is closely related with the visualization settings for edges.
netfabb will interpret adjacent triangles as one surface, if the angle of the edge sepa-rating
them is below the specification (and therefore is not visualized if the triangle
mesh is switched off, 7.2.1).
Additionally, by setting the selection tolerance at the bottom of the Status register,
you can define the maximum angle between triangles becoming part of a surface and
the triangle you click on.

SELECTION 141
So, when surfaces are selected, there are two different calculations for every triangle
in question. First, the angle of the triangle to adjacent triangles which belong to the
surface. Second, the angle of the triangle to the triangle clicked on. Both can be the
limiting factor for the surface (figure 7.9).
Figure 7.9: Surface selection limited by the visualization of edges (left) and the
selection tolerance (right).
The Shell List
If you click on the Shells register in the tabsheet, you can obtain a list of all shells
of the part. The following attributes of the shell are listed: Number of Triangles,
overall area of all triangles, outbox volume (a cuboid frame enclosing the shell),
shell volume, watertightness, orientability and outbox dimensions. The volume of
the shell can only be given, if the shell is watertight (figure 7.10). With the horizontal
scroll bar below, you can scroll to the right to see all attributes. Optionally you can
enlarge the whole context area (by drag drop on the edge of the context area) to
give the shell list more room.
If you click on one of these attributes, the shells are sorted according to that value,
first from the highest to the lowest value and with another click from the lowest to
the highest. This gives you a well-arranged overview over your shells.
If the box auto-select is ticked and you click on one of the shells, it is selected. It is
marked blue in the list and, just as normal selections, green in the screen (figure 7.11).
If you hold Ctrl, shells can be added to or removed from the selection, although
selections conducted in the screen will always be cleared. If you hold Shift, all shells
are selected which are listed between the last shell you clicked on before holding
shift and the shell you select now.

SELECTION 142
Figure 7.10: The Shells register in the tabsheet lists all shells of a part.
If you perform any editing or repairing function, naturally, the attributes of your shell
change and the information given in the shell list may be invalid. In that case, the
shells in the list are colored red. To update the list, click on the Refresh button below
(figure 7.11).
Figure 7.11: The red colored text indicates that the part has been edited and the
shell list is no longer up-to-date. Choose Refresh to update it.
So, with the shell list, you can sort your shells according to certain attributes and

SELECTION 143
select them. For example, if you have a part with many tiny shells which you want to
remove, you can sort them according to their area and then select them by clicking
on the first and then clicking on the last you want to select, holding shift. That way,
all tiny shells are selected at once and can be removed with the Delete key.
Additional Selection Options
Whenever you have selected triangles or surfaces you can expand or
shrink the selection in the context menu or by pressing Plus or Minus.
If you expand the selection, all unselected triangles adjacent to the current selection
are added to the selection. If you shrink the selection, all selected triangles adjacent
to unselected triangles are removed from the selection.
If a part has holes, all surrounding triangles can be selected by right-clicking
on the edge of a hole and choosing Select surrounding trian-gles.
Alternatively, if you click on Select Attached Triangle Only, only the triangle
to which the edge belongs is selected. That way, it is much easier to select tiny trian-gles
along open edges, which may be created while working on the triangle mesh.
In the Actions register, the button Select Shells with Negative Volume enables the
user to select all inverted shells. This function is very useful to select and then invert
or remove those shells. However, it is only reliable for closed and oriented shells.
Finally, you can perform an advanced triangle selection. Choose the option
in the context menu and use the dialog box to select or deselect triangles above
or below (or both) a certain area, volume (of the shell) and edge length (figure 7.12).
Figure 7.12: The dialog box for the advanced triangle selection

MANUAL REPAIR 144
7.4 Manual Repair
With manual repair operations you can perform simple repair and mesh editing jobs.
The manual operations are available in the toolbar. Remove selected triangles and
Flip selected triangles are also available in the Repair menu and in the context
menu, if you right-click on a selected triangle.
Add triangles: This mode enables you to close holes manually or to connect
edges. A triangle is created by first clicking on a border edge of a triangle,
which is then marked in a blue color. Now, if you move the mouse across another
border edge, you get a green preview of potentially added triangles. By clicking
on another border edge, triangles are inserted. If the two edges you clicked on are
connected by a common corner point, it is one triangle. If they are not connected,
two triangles are inserted. If any border edges of the new triangles are neighboring
other border edges, these are connected automatically (figure 7.13).
Figure 7.13: Add triangles: First, a blue marking of the first selected edge. Second,
a projection of the new triangles. Third, the resulting triangles.
Add nodes: In effect, this mode enables the user to refine the triangle mesh
manually by inserting new corner points. A corner point can be inserted by
a mouse click on a triangle. New edges are inserted, connecting this point with the
three corner points of the old triangle. So, one triangle is split into three (figure 7.14).
If a node is placed on an edge, both adjacent triangles are split into two triangles. As
long as the left mouse button is held down, the node is not placed and can be moved
across the surface to the favored position. At the same time, you can see a bright
blue preview of the new triangles. The shape of the part does not change, though the
nodes can play a vital role during further repair operations.

MANUAL REPAIR 145
Figure 7.14: A node is added in the middle of a triangle.
Move nodes (Pro feature): netfabb is basically a software for file preparation,
not for constructing. Holes and other errors therefore are repaired in the most
simple way: A hole is usually closed by a plane, a curve won’t be adapted. This can
cause troubles, especially with scans. (figure 7.15) But with the Move nodes mode
you can easily tweak the model and tinker the curves.
Figure 7.15: Left: A scan with holes. Middle: Holes are usually closed by a plane.
Right: detailed view on the plane. - You can tweak these surfaces and reproduce the
curves (see below).
When the mesh is very irregular, you should add nodes on the plane first (see Add
nodes above). Then choose the move nodes mode and pull the nodes with the mouse.
(figure 7.16)
Then you can continue repairing the file. You can for example delete unwanted

MANUAL REPAIR 146
Figure 7.16: Left: Add nodes first to have better control over the mesh. Right: Pull
the nodes with the mouse.
bumps, close the holes (figure 7.17) and smooth the new surface (figure 7.18).
Figure 7.17: Possible further editing (a): delete unwanted triangles and close holes.
Remove selected triangles: Selected triangles are deleted. This can also be
done by pressing Delete.
Flip selected triangles: The inside and outside of selected triangles are turned
around. Thus, the triangles are inverted.

SEMI-AUTOMATIC REPAIR 147
Figure 7.18: Possible further editing (b): selecte new surface and smooth it.
7.5 Semi-Automatic Repair
Semi-automatic repair options are applied to the whole part or the whole selection of
triangles, surfaces and shells. They can be found in the context menu and in the Re-pair
menu. The most important are also available in Actions tabsheet (figure 7.19).
7.5.1 Close Holes
There are three ways to close holes without manually inserting the missing triangles.
First, after right-clicking on the edge of a hole (marked yellow, if the visu-alization
option Highlight Holes is activated), you can choose the option
Close Hole in the context menu. Thus, single holes can be closed (figure 7.20). The
triangles inserted to fill the hole are automatically selected.
By clicking on Close trivial holes, all holes are closed that require either one
single triangle or for which only two border edges with the same corner point
coordinates have to be connected.
By clicking Close all holes, all holes of the part are closed automatically. This
is surely the simplest method to repair holes. However, with complicated holes
regarding geometry or orientation, it may lead to unsatisfactory results (figure 7.21).
7.5.2 Self-Intersections
Self-intersections occur whenever triangles or surfaces of one part cut through each
other. netfabb is able to detect, split off and remove those self-intersections.

Figure 7.19: Repair context menu and Actions tabsheet
Figure 7.20: After right-clicking on open edges, you can close single holes in the
context menu.

Figure 7.21: Left: For these holes only one triangle is missing. They can be repaired
with Close Trivial Holes. Right: Close All Holes automatically tries to repair all
holes, no matter how complex they are.
If you detect self-intersections, a red line will appear representing the cutting
line of self-intersections. This line is also visible, when the intersections are
within or at the backside of the part. If surfaces not only cut through each other,
but are on top of each other, all triangles which are part of that double surfaces are
marked in orange (figure 7.22).
Figure 7.22: Left: A Self-Intersection with two shells cutting through each other.
Right: All triangles belonging to a double surface in the interior of the part are
marked orange.
By splitting off self-intersections, intersecting surfaces and double surfaces
will be cut and divided along the cutting line, resulting in border edges along
the intersections. If the surfaces are part of closed shells, sections of this shell will
be cut off and can be selected and worked on separately as own shells.

The triangle mesh is changed (without changing the shape), so that neighboring bor-der
edges have identical coordinates and you get a valid triangulation across the two
shells. This is done to provide easier processing when repairing the intersection (e.g.
by stitching the triangles).
If you remove self-intersections, the intersections are split off, resulting in-terior
shells and double surfaces are removed and surfaces on the outside of
the part are reconnected. As a result, a valid shell is created (figure 7.23). Self-intersections
can only be removed, if the part has no holes.
Figure 7.23: Here you can see the interior of a part with removed self-intersections.
Interior surfaces are removed and a valid shell is created.
7.5.3 Stitch Triangles
With this function, adjacent triangles are connected. Therefore, points of tri-angles
in an identical position and the adjacent edges are merged. These edges
are marked yellow, if the option Highlight Holes in the tabsheet is activated.
Whenever the corners of triangles are not exactly in an identical position, they are
moved together. Thereby, the shape of the part is distorted very slightly. Here, the
tolerance setting determines the maximum distance corners are moved (figure 7.24).
The stitching of triangles can either be executed only with selected triangles or with
all triangles. If you stitch only selected triangles, both triangles which are to be
connected have to be selected.

Optionally, you can ignore the orientation of triangles. If you do so, triangles with op-posing
orientation will be connected as well. If you do not tick this box, the software
stitches only triangle edges with fitting orientation. In general, it is recommended
NOT to ignore the orientation, in order to prevent the creation of non-orientable tri-angle
meshes.
Figure 7.24: Open triangle edges can be repaired with the Stitch Triangles function.
7.5.4 Fix Flipped Triangles
Inverted Triangles are turned around. This is indispensable for repairing parts
with an invalid orientation. In the Status tabsheet, you can see, if you have
triangles with invalid orientation. The orientation of triangles can be seen easily, as
the outside is blue and the inside is red (with default settings, figure 7.25). In the
Status tabsheet, you can see, if you have triangles with invalid orientation.
Figure 7.25: The inside of triangles is red so that flipped triangles can be seen easily.
If the part is not orientable, a dialog is opened where you will be asked if netfabb
should try to make it orientable (figure 7.26). However, as a warning, this does not
always work and may destroy the mesh. So, to be sure, it is recommended that

you apply the repair before executing this function, optionally without replacing the
original, and start the repair module again. Not orientable surfaces can come into
being for instance because of self-intersections, or after the orientation is ignored
during the stitching of triangles.
Figure 7.26: In a dialog box, you are asked whether the part shall be made ori-entable.
7.5.5 Remove Double Triangles
Removes triangles using the same three corner points, irrespective of their
orientation. One of the triangles is kept (figure 7.27).
Figure 7.27: Triangles with the same coordinates but different orientation.

7.5.6 Select Overlapping Triangles
Overlapping triangles are those that touch or almost touch each other, no mat-ter
what angle or orientation they have. The Overlapping triangles detection
function is available in the context menu after a right-click on the screen.
In the dialogue, you can determine the max. distance of parts. All triangles below
that value will be selected. Same with the max. angle. Below you can set the
direction of the triangles. With Parallel, all triangles that have the same orientation,
will be selected. With Antiparallel, it’ll be all triangles with an opposite direction.
Or you can also select in both directions. If you want to fix your parameters as
standardized settings, press Save settings as default. If you want to get back to
previous values after you’ve changed them, click on Restore settings.
7.5.7 Remove Degenerate Faces
Degenerate faces are triangles which have no surface or only minimal surface.
In the repair screen, they are marked orange (figure 7.28). As they do not
construct any surface, they usually are unnecessary. They can come into being dur-ing
various operations, such as file conversion, Boolean Operations and all kinds of
operations which involve retriangulations. Degenerate faces in a file principally do
not result in bad parts when manufactured, but they may dramatically increase the
number of corner points and hatches in the slice files necessary for the production.
This may cause much longer calculation and production times.
With this function, the degenerate triangles are deleted. By setting the tolerance, you
can set the maximal edge length and height of the triangles which shall be deleted.
7.5.8 Extract Selected Triangles As Part
The current selection is inserted into the project as own part and is added to
the parts section of the project tree. That way, for example, surfaces or single
shells can be added to the project for subsequent operations (figure 7.29). On request,
you can either keep the extracted triangles in the repair or delete them.
This function can be used to start a second repair module for the extracted sections
or shells only. So, you can conduct general, semi-automatic repair operations only
for these extracted triangles. If you do so, delete the selection when you extracted

Figure 7.28: The orange-marked triangle has no and consequently looks like a one-dimensional
line.
them from the first repair and, after you have applied the second repair, use drag
drop in the project tree to move the part back into the first repair.
Figure 7.29: Make a selection and extract it as own part.
7.5.9 Split Non-Oriented Edges
If triangles with opposing orientation are connected in a mesh, they are sepa-rated
by this function (figure 7.30).

Figure 7.30: Edges with opposing orientation are split off, resulting in two boundary
edges.
7.5.10 Wrap part surface (Private/Pro feature)
The feature Wrap part surface is available in the Repair menu. It creates
one shell from the surface that is accessible from outside and deletes meshes
and triangles that are inside. That is a very helpful tool if you want to get rid of the
interior shells. (figure 7.31) For example, if you want to print a model of a house and
don’t need the walls inside, you just use the Wrap and then only print the outer walls
and the roof, save material and make the whole job a lot less error-prone.
Figure 7.31: Left: Part with interior shells. Right: Part after the wrap, only the
outer shell remains.

AUTOMATIC REPAIR (PARTIALLY PRIVATE/PRO FEATURE) 156
7.6 Automatic Repair (partially Private/Pro feature)
By clicking on the Automatic Repair button in the tabsheet or on Automatic
Repair in the context menu or Repair menu, one of several repair scripts
can be executed. Thereby, predefined repair operations are executed in a predefined
sequence. The simple repair, the default repair and the extended repair are already
prespecified and cannot be altered (figure 7.32). The simple repair automatically
fixes flipped triangles and first closes trivial holes and then all holes. The default
repair automatically performs most semi-automatic repair functions. The extended
repair is the most powerful one and additionally wraps the part in order to delete
unwanted inner shells or doubles triangles.
Figure 7.32: Choose one automatic repair option in the dialog box.
In the Repair Scripts register of the tabsheet (figure 7.33), you can define individual
repair scripts, as well as view, edit and save existing and new automatic repairs. The
drop-down menu at the top shows you which repair script you are currently working
on. New scripts can be created by clicking on the button with the blue plus-icon. If
you want to remove existing scripts, double-click on the red X.
In between, there is a button depicting a gear wheel. After clicking on that button,
you can load scripts, save the current script, duplicate your script or rename it.
The field below shows which repair functions are performed in which sequence by
the script. The sequence of the repair functions can be changed by clicking on one
of them and moving it by drag drop within the list. By clicking on the green tick
next to a listed function, you can perform one function separately, and by clicking on
the button with the red X, the function is deleted from the script.
Some operations in the script have a little Plus on the left side. If you click on it,

AUTOMATIC REPAIR (PARTIALLY PRIVATE/PRO FEATURE) 157
Figure 7.33: Repair Script of Default Repair.
a tree is opened and you can view and edit the parameters of these functions, for
example the tolerance (figure 7.34).
Figure 7.34: Specifications for the function Stitch Triangles can be altered within
the repair script.
Below the field containing the chosen functions, there is a drop-down menu which
includes all repair functions which can be added to a script. This can be done by
selecting a function and click on Add. Clicking Clear deletes all functions from
the script. Finally, the repair script can be saved to your disc, for example to be
copied to other computers, or it can executed directly.

EDIT TRIANGLE MESH (PRIVATE/PRO FEATURE) 158
7.7 Edit Triangle Mesh (Private/Pro feature)
7.7.1 Refine Triangle Mesh (Private/Pro feature)
This feature is available in the Mesh Edit menu or the context menu, if you
right-click on the screen.
This feature is available in the Mesh Edit menu or the context menu, if you right-click
on the screen. It refines the triangle mesh, minimizing the maximum edge length to
a new value which must be specified in the dialog box (figure 7.35). Below are the
information about the size of the selected faces and the length of the longest edge. It
helps you to find appropriate values for the triangle refinement (figure 7.36).
Figure 7.35: The dialog box for refining the triangle mesh.
You can either refine the triangle mesh of the whole part or, by ticking the box in the
dialog, only refine selected triangles.
The existing triangles are split into smaller triangles until no triangles with too long
edges remain. The number of triangles increases, often dramatically. The shape
and outer appearance of the part is not changed during this process. However, a
refinement of the triangle mesh can be essential for subsequent operations, such as
making a selection or smoothing triangles.

Figure 7.36: The triangle mesh of the selected side walls of this cube is refined.
7.7.2 Reduce Triangles (Private/Pro feature)
This feature can be found in the Mesh Edit menu or in the context menu after
right-clicking on a selected triangle. You have to have at least 5 triangles
selected for this function. In the triangle reduction, netfabb unifies triangles to create
bigger one. When you start the function, a dialog box appears with the tabs Basic
Reduction and Advanced Reduction. The basic mode is useful, as it proceeds
very quickly. If you need more accurate results, we recommend to use the advanced
mode.
In both dialog boxes, you can see how many triangles are selected and you can set, if
you want to reduce the triangle count to a certain target count or if you simply want
to reach the lowest possible number of triangles. If the triangle mesh is very much
finer than necessary, it is recommended to conduct the triangle reduction in several
steps, for example halving the triangle count. Otherwise, you may get unwanted side
effect like double surfaces (figure 7.37).
Below, there are a few important condition you can define for the triangle reduction.
The maximum deformation represents the maximum change in volume of the part.
The maximum collapsed edge length determines the maximum lenth of edges which
are unified. Please note that wrong condition settings, for example extremely high
values, may lead to unsatisfying results, such as strong distortion or self-intersections
(figure 7.38). In the advanced reduction you can choose the Fast mode, which works
faster but a little less accurate. This is very useful if you just want to test reduction
figures.

Figure 7.37: Left: For a quick triangle reduction. Right: For a more accurate
reduction.
Figure 7.38: The number of triangles is reduced without any distortion of the part.
7.7.3 Z-Compensation (Pro feature)
Whenever working with laser machines, it is likely that the first layer of a
model is printed thicker than the following. If you’re making small parts, this
can cause real problems, as the bottom of the part will be lengthened in the z-axis and
the shape of the part is changed severly. With the Z-Compensation, it’s possible to
counteract his effect. Select the part and go to the repair mode. The Z-Compensation

is available in the context menu or in the Mesh edit menu. Choose the translation
value of the part, which depends on your machine. (figure 7.39) The bottom of the
model will be clinched about this certain value (figure 7.40).
Figure 7.39: 5.00mm defined as Z-Compensation
Figure 7.40: Original Sphere on the left and a sphere with 5.00mm Z-Compensation
on the right.
7.7.4 Smooth Triangles (Private/Pro feature)
This function smooths rough surfaces and rounds off sharp edges. It is avail-able
in the Mesh Edit menu or the context menu of the screen. When you
start the function, a dialog box appears where you can choose how often you want to
repeat the smoothing process (iterations) and where you can tick a box to choose, if
you want to smooth all triangles of the part or only selected triangles (figure 7.41). In
the Advanced mode you can determine the smoothing settings more precisely, which
may result in longer calculation times.

Figure 7.41: Define smoothing precisely.
With every iteration, the following process takes place: For each corner point of the
triangle mesh, the average position of the adjacent corner points is calculated. The
position of the first corner point is then adjusted to this average value. That way,
surfaces become smoother and corners and sharp edges of objects become rounder
and are pulled inwards. The surface of the triangles is reduced by that process, as
corner points are drawn more closely together. In the Basic mode it is important that
your triangles have a similar size. That is why it is recommended to refine triangles
before smoothing the triangle mesh. Otherwise, the result of the smoothing depends
very much on the triangulation and less on the actual shape of the part.
In the advanced mode, you can set the smoothing strength in glide ratio, which means
that you are able to define the level of smoothing more precisely. Then, there are three
different options: Selected Triangles only: see above. Prevent volume shrinking:
The part will be deformed but the volume won’t get any smaller. Triangulation
independent: As it’s being considered that the triangles have a different size, you
hardly get any deformation effect and the shapes will be retained. This way, you
don’t have to refine the triangle mesh before smoothing.
7.7.5 Cut Surfaces (Private/Pro feature)
With this function in the repair module, it is possible to draw lines on a part
and cut the surface of the part along that line. Triangle edges are inserted
along the drawn line and are split open. This feature is available in the toolbar, in the
Mesh Edit menu or the context menu of the screen.

Figure 7.42: Left: Surface marked for smoothing, edges with more than 10 visual-ized.
Right: Smoothed triangles, no edges with more than 10 remain.
Figure 7.43: Smoothed Cube (five iterations).
When this mode is activated, you can click anywhere on the surface of the part. With
every additional click, a red line is inserted between the last two points you clicked
on. That way, you can draw a line by clicking on the surface of your part. If the
surface is not flat, the line may be inserted along existing triangle edges (figure 7.44).
If the surface is not flat, the line may be inserted along existing triangle edges, as the
path of the line is calculated newly for each flat area.
When you right-click on the screen, you have three options in the context menu. With
Reset Line, the line is removed and a new line can be created. With Close Line, the
first an the last point are connected and the line is finished. No further points can be
added. If you click on the surface again, the line is removed and a new line is started
(figure 7.44).

Figure 7.44: Left: A red line is inserted between the points clicked on. Center:
Choose Close Line in the context menu. Right: The first and the last point of the
line are connected.
The option Insert to mesh includes the closing of the line and has two further effects.
Firstly, triangle edges are inserted along the drawn line and the surface is retriangu-lated
accordingly. Secondly, the surface is split along the line, creating open border
edges (figure 7.45). Consequently, everything within the line becomes an own shell
and can be selected with the Select Shell mode in the toolbar. If you have chosen
only two points, the surface is only split along the line and no new shell is created.
Figure 7.45: Left: Choose Insert to Mesh in the context menu. Right: New triangle
edges are inserted and the surface is split.

7.7.6 Offset Hole Edges (Private/Pro feature)
This function is available in the context menu after right-clicking on the border
edge of a hole (figure 7.46).
Figure 7.46: When you right-click on a border edge, you can create an offset of the
hole.
By creating offsets of hole edges, triangles are inserted at border edges which lie in
the same plane as the triangles adjacent to the hole edges. That way, for example,
holes can be made smaller without closing them completely. In a dialog box you can
insert the distance from the old border edges to the new ones (figure 7.47).
Figure 7.47: In this dialog, you can set the distance of the offset.
Then, triangles are attached to the edges of the hole. For each border edge and each
corner point of the hole, another edge and corner are inserted at the distance you
defined in the dialog. New triangles are placed, enlarging the existing plane of the
neighboring triangle. New corner points are placed along the cutting line of the two
new triangles (figure 7.48).

Figure 7.48: Left: The original mesh. Right: An offset with 1mm distance is created.
If one or more triangles on the part are selected, netfabb creates only offsets along
the edges belonging to these selected triangles (figure 7.49).
Figure 7.49: Left: Here, a few triangles are selected before creating the offset. Right:
The resulting offset.
7.7.7 Extrude Surfaces (Private/Pro feature)
This is an advanced mesh editing function available in the toolbar, in the Mesh
Edit menu or the context menu, if you right-click on a selection.
It allows you to change the shape of objects. First, select the triangles or surfaces
you want to move and activate the function Extrude Surfaces. In that mode, a grey
surface is displayed which represents the new position of the extruded triangles. At
the beginning it is shifted from their old position by 1mm.

You can now change the position of these triangles by drag drop in any direction
and by any distance. By pulling it outwards, the part is expanded accordingly and the
volume increases. If surfaces are moved inwards, the volume is reduced. If you hold
Shift, the distance by which the triangles are moved is locked and only the direction
changes. If you hold Ctrl, the direction is locked and only the distance changes
(figure 7.50).
If you double-click on an existing surface of the part, the direction of the extrusion
is adjusted along the orientation of the triangle you clicked on, in a right angle to
its face (figure 7.50, 7.52). With every further double-click, the direction is changed
by 180. The triangle you click on does not have to be part of the surface which is
extruded.
Figure 7.50: Extrusion of a Box: First, select surface. Second, pull the surface out
in any direction by drag drop. Third, align the extrusion by double-clicking on the
original surface. Fourth, by applying the extrusion the box is expanded.
Similarly, by double-clicking on a triangle edge, the extrusion is aligned along the
edge, switching the direction with every double-click (figure 7.52).
With the button Apply in the tabsheet, the extrusion is performed. The chosen trian-gles
are moved according to your settings and new triangles are inserted to connect
the original part with the new triangles.
If the option Move Points is activated, the module does not add new triangles to
expand the part, but simply moves the points of the selected triangles. That way, all
neighbouring triangles are repositioned to connect the old part and the new surfaces.
This can lead to a different kind of shape as the standard extrusion (figure 7.51, 7.52).
The direction of the extrusion along the three axes and the distance to the original

Figure 7.51: Move points: Only the corner points of triangles are drawn outwards,
changing the shape of all adjacent triangles.
Figure 7.52: Left: This extrusion is aligned to the top surface, not to the original
surface. Right: Here, the surface is extruded along one of its own edges. Combined
with Move Points, it is simply pushed upwards, the surface below is stretched and
the angle of the top surface is adjusted.
surface can also be set in the parameters box in the tabsheet to the right (figure 7.53).
You have three fields for the direction, representing the X-, Y- and Z-axes. The
proportion of the number you enter here determines the direction of the extrusion.
You can enter both positive and negative values. If you want to extrude in the positive
X-direction, for example, set the values for Y and Z to 0 and the value for X to any
positive number. If you want the extrusion to differ from the positive X-direction to
the negative X-direction by 30, set the value for Z to 0, set a negative value for Y and
set a positive value twice as high for X. If you change the position of the extrusion
by drag drop, the value are updated automatically in the tabsheet.

Shift is the distance of the new corner points of the extruded triangles to the old cor-ner
points. As for the direction, the shift can be positive or negative. Negative values
make sense, for example, if you have already set the direction and want to go exactly
into the opposite direction. Surfaces can be extruded at any length (figure 7.54).
Figure 7.53: Parameters for extruding surfaces.
Figure 7.54: Surfaces can be extruded at any length.

The button Estimate Direction calculates the average orientation of all selected tri-angles
and aligns the extrusion in that direction (figure 7.55). This is most helpful
for extruding surfaces whose triangles are not parallel. The average direction of the
triangles is also set automatically at the start of the feature.
Figure 7.55: Extrusion of one half of a Sphere.
If you want to fix your parameters as standardized settings, press Save settings as
default. If you want to get back to previous values after you’ve changed them, click
on Restore settings.
7.7.8 3D-Extrude (Private/Pro feature)
This feature works similar to extruding surfaces. It does not only change the shape
of the part in one direction though, but in 3D. This can be very helpful to determine
an offset for specific regions of a part. You can find the 3D Extrude in the tab right
next to the Simple Extrude.
Select the surface you want to edit and shift the extrusion by pulling the grey surface
that is displayed. You can also enter exact value in the Shift field on the right or
with the slider (figure 7.56).
By checking the Smooth box, the direction of the surrounding triangles will also be
considered in the calculation. This way, the contrast between extrusion and remain-ing
surface won’t be so radical. With the Improved mode, the size of the selected
triangles are factored in. That means, that the direction of the extrusion is mostly
determined by the bigger triangles.
For further explanations about the Extrude type and Settings, please take a look at
chapter 7.7.6.

Figure 7.56: 3D Extrusion of one half of a Sphere.

THE MEASURING TOOL 172
Chapter 8
Measuring and Quality Assurance
8.1 The Measuring Tool
The measuring tool is activated by selecting a part and clicking on the mea-suring
icon in the toolbar or choosing New Measuring in the Extras menu or
Extras submenu of the context menu.
It allows the measurement of distances between points, edges and surfaces, as well
as radii and angles. It opens the measuring screen with the selected part only and
provides all measuring options in the tabsheet, where instructions are given and all
measuring results are specified in detail (figure 8.1). The options for changing per-spectives
and zooming in the measuring screen are the same as in the main screen,
only with less default zoom options.
In the project tree, the measuring is integrated as subordinate directory of the part,
with single measuring operations as subordinate elements to that directory. After
conducting other operations, you can always return to the measurement by selecting
it in the project tree. If you right-click on the measuring in the project tree, you can
rename it or remove it (figure 8.2).
The measurements are performed by the setting of anchor points. It is possible to
define any number of measurement operations in the same screen and measuring.
For a subsequent quality test, it is also possible to set anchors in order to add notes.
When a measurement is conducted, a blue line (=arrow) appears between the an-chors
and the result of the measurement is shown in a small box in the middle (fig-ure
8.3). Also, a new anchor is created in the center of the measurement, either in the

Figure 8.1: The tabsheet offers various measuring options.
Figure 8.2: Rename or remove a measurement through the context menu in the
project tree.
middle of a distance or in the center of a radius or at the apex of an angle. All anchors
can be used again for subsequent measurements (as in figure 8.12 and 8.15).
The box specifying the measured value represents a measuring point and, by drag
drop, can be moved sideways together with the blue line into a parallel position.
In that case, the ends of the line are connected to the anchors by two more arrows,
and the measured distance is marked by a more conspicuous yellow measuring line,
if the option Show anchors (see below) is activated. That way you can get a good
overview of measurements and it is easier to use the central anchor (figure 8.3).
A measure point is selected by a left-click and can then be removed by pressing
the Delete key. By right-clicking on the box with the measured value or on the

Figure 8.3: Left:Measurement between two points on a Surface. Right: Measure-ment
of point on edge to a corner point. The measuring arrow is dragged sideways,
providing a good view and access to the central anchor.
respective measurement in the project tree, a little context menu appears, in which the
measuring point can be either edited or removed (figure 8.4). Editing the measuring
point, you can add notes to the measurement and change its appearance regarding
the arrow color, font color, border color, background color and level of transparency
(figure 8.5). If you show the hidden arrow, the yellow measuring line will also have
the color of the remaining arrows. By deselecting Show Value, the result of the
measurement is hidden. If you remove the measure point, the whole measurement is
removed, including its anchors and all other measurements using these anchors.
Figure 8.4: Context menu of a measuring point.

Figure 8.5: Edit Appearance dialog box
8.1.1 Cutting Lines
You can also set cutting lines on your part. These cutting lines can be used to set
anchors to specific coordinates (figure 8.6). Cutting lines can be edited with the
regulation bars at the bottom of the tabsheet below the measuring options. It is also
possible to hide and show sections of the part before and after the cutting line. For a
description of the exact use of the cutting options, see chapter 6.4. To set cuts with
the mouse, you can right-click anywhere on the screen and choose a cut across any
axis, which you can then set by clicking on the part.
8.1.2 Setting Anchors
All measurements are defined by anchor points. They can be placed simply by a
mouseclick. If you hold the left mouse button, you can still move the mouse before
placing the anchor. A preview of the measurement, including the measured value, is
displayed, changing as you move the mouse across the part. At the same time, you
can rotate and shift the view and zoom in or out with the mouse, which enables you
to place your anchors very precisely. The anchor is set as soon as you release the left
mouse button.
There are several options for the setting of these anchors:

Figure 8.6: Measurement of a surface to a point on a cut.
Point on Surface: The anchor is placed wherever you click on the surface of
the part.
Point on Edge: The anchor is placed on an edge of the surface. If you do
not click exactly on the edge, the software sets the anchor point on the closest
edge.
Corner Point: The anchor is placed on the closest corner point of two or
more edges (figure 8.7).
Point on Cut: By clicking on or close to the cutting line, an anchor is placed
on the cut (figure 8.7).
Figure 8.7: Measuring of point on cut to corner point

Corner Point on Cut: Places anchor on a corner of the cutting line (fig-ure
8.8).
Figure 8.8: Measuring of two corner points on cut.
Show Anchors: With a click on the icon to the right, anchors can optionally
be shown as a yellow rectangular point (default). When this highlighting of
anchors is switched of, the yellow measuring line, which is visible when the
measuring point is dragged sideways, will disappear as well, making place
for the normal arrow.
These anchors can be used either for measuring distances, angles or radii.
The measurement is conducted by first choosing the measuring options and then
setting the anchors. It is possible to set the anchors of one measurement with
different options.
Depending on what you want to measure, you have again several options:
8.1.3 Measure Distance
With this option you can calculate the distance of either points, lines or sur-faces,
depending on which mode you choose by clicking on the icons in the
tabsheet (third row). These modes can overrule the options for setting anchors: an-chors
for measurements to lines, for example, are always placed on edges, no matter
which option you have chosen for the anchor.

Wall Thickness: By clicking on a surface, the distance to the next opposite
surface is calculated, with the measuring line running in a right angle inwards
from the selected anchor (figure 8.9). For hollow parts, this is usually the wall
thickness, for solid parts it is the diameter of the part at this point.
Figure 8.9: Wall Thickness
Point-to-Point: The distance of two anchors is measured, which you can
place freely on the part, taking into account the anchor setting options above.
Point-to-Line: Calculates the shortest distance from any point to a line run-ning
along an edge, with an imagined extension beyond both of its ends on
the part (figure 8.10).
Line-to-Point: As Point-to-Line, but select first the line, then the point (fig-ure
8.10).
Figure 8.10: Measurement of point to line. The Line is extended beyond its corners.
Line-to-Line: Calculates the shortest distance between two lines. For two
lines cutting through each other, this distance is 0. Otherwise the points on
the lines which are the closest together are taken as anchor points for the
measurement. Again, for the measurement, the lines are extended beyond its
end points on the part.

Surface-to-Point: Calculates the distance from a surface to a point. Click
first anywhere on the surface, then set an anchor anywhere on the part. For
the measurement, the surface is extended beyond its edges (figure 8.11).
Figure 8.11: Left: To measure the distance between a surface and a point, first click
on the surface. Center: When you hold the left mouse button as you set the second
anchor, a preview of the surface is displayed. The surface is extended beyond its
edges. Right: The result of the measurement.
8.1.4 Measure Angles
There are two methods to measure angles, after clicking on the icon for mea-suring
angles in general:
Three points:With that option, you can set anchors anywhere. The first an-chor
determines the first arm, the second anchor determines the apex and the
third anchor determines the second arm. netfabb calculates the angle between
the two arms, which run from their anchor through the apex (figure 8.12).
Two Edges: Anchors will always be placed on edges. Click on two edges
to get the angle between them. The edges are extended beyond their corner
points on the part. If the edges do not cut through each other, one edge is
moved parallel so that they do cut and an angle can be calculated (figure 8.13).

Figure 8.12: Measurement of the angle between the top surface and the side edge
by three points: First, measure distance of opposite edge of top surface and use the
central anchor as first arm. As apex, the corner point of the side edge and the top
surface, and as second arm, a point on the side edge is chosen. This results in the
angle between the center of the top surface and the edge.
Figure 8.13: Left: Measurement of angle by two edges. Right: Here, the edges do
not cut, so the edge of the top surface is moved parallel until it cuts the side edge.
8.1.5 Measure Radius
It is possible to measure the radius of both circles and spheres. The specified
value is the diameter of the circle or sphere. You can place the anchors for

the measurement freely with any of the anchor setting options:
Circle Arc: Click on a circle on the part or on a smooth curve to get its radius.
It is not necessary that the curve forms a complete circle (figure 8.14).
Figure 8.14: Left: The diameter of a half-circle is measured by clicking on the circle
arc. Right: The radii of the two circles on the top and on the bottom of the cone are
measured and their diameter specified. This also creates new anchors in the center
of the circles. With help of those anchors, it is possible to measure the distance of the
circles (and consequently the height of the cone).
Three Points on Circle: Select three anchor points anywhere on the part. A
circle running through these points is calculated and its radius is measured
(figure 8.15).
Four Points on Sphere: Calculates a sphere through four anchor points and
specifies its radius and its center (figure 8.16).
8.1.6 Add Note
With this option, the user can place anchors to add notes. In a dialog box,
the appearance of the note can be changed in terms of the arrow color, font
color, border color, background color and level of transparency. This can be done in
a similar way to the editing of measure points (figure 8.5).

Figure 8.15: Radius measured with three points: By measuring three edges of the
top surface, new anchors are created in the center of these edges. These anchors can
be used to calculated the radius of the inner circle of the surface.
Figure 8.16: Radius of a sphere, gained by selecting four anchor points on the dome.
Also, an anchor is set at the center of this half-sphere.
8.1.7 Set Default Modes
After right-clicking on the icons in the tabsheet, you can set your default measuring
mode. netfabb remembers your settings for setting anchors and for your measuring
tools. If you click on Use this mode as default or Use this tool as default, this
option will be activated at the start of all measurings from then on (figure 8.17).

TEST 183
Figure 8.17: After a right-click on the buttons in the tabsheet you can make the
respective options your default settings for future measurings.
8.1.8 Lock and Unlock View
To the right of the measuring in the project tree, there is a little icon to lock or
unlock the perspective. This only plays a role, when a second measuring or a
test of the part has been added and you switch back from that other measurement or
test.
If the view is not locked and you return to the measuring (click on it in the project
tree), it always takes over the perspective from the element opened before.
If you want netfabb to remember a perspective, lock the view. The perspective of
the measuring is saved at the moment you do so. As long at the view stays locked,
netfabb always goes back to that perspective when you return to the measuring. It
does not matter, to which perspective you have rotated the view in the same or in
another measuring.
That way, you can choose a separate perspective for each of your measurings and
keep this perspective for subsequent tests.
8.2 Test
The testing function can be started in the toolbar and adds a new test directory
in the project tree, within which subordinate elements are available to conduct
tests (figure 8.18). Specifications can be entered in the tabsheet below. The tool can
also be accessed in the Extras menu of the Extras submenu of the context menu of
the part.

TEST 184
You can test the quality of fabricated parts regarding their dimensions and other at-tributes.
For the testing of dimensions, measurements conducted with the virtual part
in netfabb serve as reference value. So, the testing function allows you to cross-check
the measuring results of fabricated parts with measurements conducted in netfabb.
Acceptable limits of deviation can be defined for each measured value.
If you right-click on the test, it can be renamed or removed entirely in the context
menu. If you want to remove only some subordinate elements, right-click on that
specific element and click Remove.
Figure 8.18: A finished test in the project tree.
8.2.1 Create Definition
To be able to get a useful test result, it is important to create a precise definition of the
test. In the definition directory of the test in the project tree, all measurings conducted
with the part are listed, with single measurements as subordinate elements.
If you click on the Definition directory or on a measuring (group of measurements),
you can take offsets and scales into account, which are expected to occur during

TEST 185
production, and you can specify general standard tolerances. These are acceptable
values for deviations in general, measured in mm for distances, for angles and %
for circle diameters (figure 8.19). With the button Apply, tolerances are calculated
according to these values for all single measurements.
The single measuring operations (measuring points) are included into the test if the
box next to their name is ticked in the project tree. If you click on the measurement,
you can see the reference value, which is based on the measured value and could be
modified by the general definitions, and you can insert the upper and lower acceptable
value for every measurement (figure 8.19). The offset which you have set in the
general definition, can be either added or deducted, depending on the option you
choose in the dropdown menu. In the text field below, you can add notes for the test
of this measuring point.
Figure 8.19: Left: A general definition for all measurements. Right: The definition
for a single measurement.

TEST 186
8.2.2 Values
If you want to test other attributes of the part, click on the Add Value button
after selecting the values directory, double-click on the blue Plus next to the
directory or right-click on the Values directory and choose Add Value in the context
menu. Then, add and specify additional values. You can insert the name of the
attribute and choose one of three ways to define the criteria of the value: an exact
value, as with measurements, a Yes/No distinction or a choice from several options
(figure 8.20).
Figure 8.20: Left: Insert exact value and limits. Center: Yes or No can be defined as
correct. Right: Choice from several options. By clicking on the Plus button, options
are added. The ticked option is defined as correct.
8.2.3 Test Result
When you click on the test in the project tree, the button New Test Result is
available. The same is obtained by a double-click on the blue Plus next to the
Test directory or in the context menu after right-clicking on the test. The test result is
added to the test directory. You will see which measurement of the real manufactured
part is within an acceptable range and which one is not (figure 8.21).
In the test result, all measurements and values which are activated in the definition
(by ticking the box) are listed. For every measurement and every value, the measured
values must be inserted. If these values are within the defined tolerance, the attribute
is colored green in the test result. If they are not, it is colored red (figure 8.18).

TEST 187
Figure 8.21: Left: Enter the measured value. Center: Specify, if the attribute is
given. Right: Select the attribute which applies.

THE SLICING PROCESS 188
Chapter 9
The Slice Commander (partially Pro
feature)
The slicing process dissects a three-dimensional part into two-and-a-half-dimensional
slices. These are a collection of two-dimensional layers. The slice
files are vital for manufacturing parts, as 3D-printing machines cannot read three-dimensional
data.
Furthermore, slices provide you with a visualization of cross sections of your part,
and you get more detailed information about the object. You also have the chance to
edit your slices before fabricating them. Many of these functions are also available
in the three-dimensional data management. However, in the Slice Commander, you
have the advantage that calculations are performed much quicker, as complex 3D-tasks
are replaced by 2D-tasks. This reduces the complexity of the data handling.
For slices, there is an own section in the project tree, where all slices are organized
in the same way as parts in the part section.
9.1 The Slicing Process
For Slice Files, a three-dimensional object is cut into horizontal slices and
saved as a great collection of two-dimensional cross sections with a certain
specified thickness.
Parts or sections of all selected parts can be sliced with any layer size by dragging
them from the parts section into the slices section in the project tree (figure 9.1).

THE SLICING PROCESS 189
Alternatively, you can select the part and choose Slice Selected Parts in the Extras
menu. If more than one part is selected, all selected parts are sliced together.
The part is then sliced into layers with a certain thickness which are parallel to the
X-Y-plane (figure 9.2).
Figure 9.1: To slice a part, move it into the slices section with drag drop.
Figure 9.2: A three-dimensional part (left) and three of its slices (right)
Three parameters must be set for the slicing process: The layer size determines the
thickness of the slices, which directly influences the number of layers created (fig-ure
9.3). If you plan to build the part, it is recommended to adjust the layer size to
your machine specifications.
Start and Stop determine the sliced section of the part. The values to be entered
represent the coordinate value on the Z-axis of the planes where the slicing begins

THE SLICES SECTION 190
and stops. Everything between those planes is sliced. At the beginning, the sliced
section includes all selected parts completely.
Figure 9.3: Dialog box for slicing a part
9.2 The Slices Section
When the part is sliced, the resulting slice is inserted into the slices section of the
project tree and is automatically selected. Any time slices are selected, the Slice
Commander is activated. Changing slices in the Slice Commander does not have any
influence on original three-dimensional parts in your project.
The viewing screen is replaced by a slices screen, where slices are displayed layer-by-
layer. Slice viewing and handling options are available in the tabsheet, in the
context menu of the screen (figure 9.4) and in a Slices menu, which is added to the
menu bar.
Previously saved slice files with various file formats can alternatively be opened and
inserted into the project with the File Preview Browser or with the option Open Slice
File in the context menu.
Just as parts in the normal mode, slices can also be assigned to groups. These
are created in the context menu and appear as a directory in the Slices sec-tion
of the project tree. Slices can be moved into and out of groups by drag drop,
in the same way as parts (chapter 5.7)
If you want to remove slices, you can either double click on the red X to the
right of the slice in the project tree, choose Remove in the context menu or
simply press Delete when the slice is selected. If you choose Remove all, all slices
will be removed and the Slice Commander will be emptied.
For further information about the Export functions in the Slice commander, take a
look at chapter 9.7.

ACTIVE SLICE FILE 191
Figure 9.4: Context menu and tabsheet of Slice Commander.
Slices can be duplicated in the context menu. That way, an exact copy of the
slice file is inserted to the right of the original.
9.3 Active Slice File
In the tabsheet, information can be viewed on the selected slice file. It contains the
name of the current slice, the size of the whole part, its area, contour length and
hatches length. Min. Z and Max. Z give you the exact position along the axis.
The scroll bar on the left regulates the display of layers from top to bottom. You
can also scroll through slice layers with your mouse wheel, if you hold the Alt-button.
If a slice animation is started, the Slice Commander automatically browses
through the slices at a chosen speed (Layers per Second).
The global information specifies the current layer and overall layer count of all slice
files in the Slice Commander (unlike the active slice file, where only the specifica-

SLICE SELECTION AND HANDLING 192
tions for one file is given). Different files can share layers, if they have common
Z-coordinates.
If the box Preview Calculations at the bottom of the tabsheet is ticked, the result of
conducted operations with slices is shown. However, this can require much calcula-tion
time when you scroll through the slices.
9.4 Slice Selection and Handling
The Slice Commander contains several functions for the viewing, handling and
editing of slices. All of these functions are applied to all layers of the slice.
9.4.1 Select Slices
As parts in the normal mode, slices must be selected, if you want to edit them.
A selection of slices is assembled similar to the selection of parts in the normal
mode (chapter 5.2). You select slices by clicking on their edges, on their names in
the project tree or by dragging a selection rectangle around the slices you want to
select. Selected slices are always framed by a green, rectangular selection box, with
highlighted corners and centers of edges.
If you select slices in the screen and hold the Shift key, slices are added to the selec-tion
by clicking on them. If you hold Ctrl, slices can be both added to or removed
from the selection by clicking on them. If you hold Shift and select slices in the
project tree, clicking on a slice file selects all slices in the list between the selected
slice and the slice you click on.
9.4.2 Slice Viewing Options
The most obvious difference of the Slice Commander to the normal mode is that the
screen is underlain by a two-dimensional coordinate system, showing the slices in the
X-Y-plane. If the option Show platform is activated in the View menu, the outline
of the platform is shown in the slices screen (figure 9.5). This is very helpful when
you position your slices and prepare you build data for prints, especially combined
with the option Show Outbox (see below). The platform can only be seen in layers
where it really is.

Figure 9.5: The screen of the Slice Commander with the coordinate system, the
platform and four slice files with their outbox. Thanks to the outbox of the top left
slice, you can see that this slice may stand out of the platform.
Below this screen, the position of the mouse cursor is specified (figure 9.6), whereas
the position on the Z-axis depends on which slice you are watching (changed with
the scroll bar in the context area).
Figure 9.6: The coordinates of the mouse cursor, as specified below the viewing
screen.
Zoom Options for Slices
As the slices are two-dimensional, it is not necessary and not possible to change the
perspective. But apart from this, the viewing of slices in the slice screen works very
similar to those in the main screen.
You can shift the view by holding the central mouse button and moving the mouse.
If you do not have a central mouse button, hold Shift and the right mouse button.
With the scroll button of the mouse, you can zoom in and out. If you do not have a
scroll button, hold both Ctrl and the right mouse button and move the mouse up and
down.

Also, you can use one of four default zoom options available in the toolbar:
Zoom on all selected files, zoom to all slice files or zoom to a selection rectan-gle
you draw with your left mouse button.
Visualizations
For the visualization of the slices, you can show and hide slices, change their color
and three options in the context menu.
Slices can be hidden or shown by clicking on the eye next to the slice’s name
in the project tree or in the context menu. Hiding slices that do not need atten-tion
for the moment can be helpful to keep, if you have many different slices.
The color can be changed with an option in the context menu. It’s exactly as
with three-dimensional parts in the standard module (chapters 5.7, 10.2).
In the context menu after right-clicking on a selected slice, you find the following
visualization options (figure 9.7):
The outbox is the border of a slice file. It is always rectangular, regardless of the
shape of the slices, and is adjusted to the layer with the widest expansion. If Show
Outbox is activated, the outbox is represented by a dashed line. This is especially
interesting, when parts are not selected. Otherwise the selection box may cover the
outbox.
With Show Points, all corner points of contours and all end points of hatches are
highlighted. This can include points on straight lines, as in the slicing process, a
point is inserted at every place where in the original three-dimensional part a triangle
edge was running over a surface.
Show Filling fills the contours of a slice with a very fine grid. In the settings, you can
edit the grid size of the filling and you can choose to display only the horizontal or
only the vertical lines (chapter 10). With default settings, the grid size is very small,
and the filling looks like one colored surface, if you do not zoom in (figure 9.8).
9.4.3 Move, Rotate, Scale and Mirror Slices
The positioning of slices is very similar to the positioning of three-dimensional parts.
These operations can be conducted either by drag drop or by inserting specific
values in a dialog box (figure 9.10). If you move parts by drag drop, the values

Figure 9.7: Left: Selection box (outside) and outbox (inside) of a rotated slice. Cen-ter:
Show Points. Right: Show Filling.
Figure 9.8: Zoom in to see the grid lines the filling.
for the scale, translation and rotation are updated live in the tabsheet as you move the
mouse.
Selected slices can be moved around on the X-Y-plane by drag drop, click-ing
either on the selection box or on the green square in the center of the
slice. Alternatively, by clicking on the Move Slices-icon in the toolbar or choosing
Move in the context menu, a dialog box for manual transformations is opened. At
the top of the dialog, the current selection, the part’s position and size are specified.
Then you can set specific coordinates along all three axes for moving the slice. If the
box relative translation is ticked, the coordinates you enter represent the direction
of the movement from the current position. Or you can enter the coordinates for the
absolute position with reference to the the origin with the X- and Y-coordinates zero
(Abbildung 9.9). If the box Keep window open is ticked, you can apply the changes
by Translate, the dialog will stay open and you immediately can move the part
again.
The rotation of slices can be performed by clicking on the corners of the
selection box, holding the left mouse button and moving the mouse. If you
hold Ctrl, the slices are rotated in 10 steps. If you hold Shift, they are rotated in
45 steps. With the Rotate Slices-icon in the toolbar or the option Rotate in
the context menu, you get the dialog box, just like in the three-dimensional default
mode. You get the main information about the part again and you can specify an

Figure 9.9: Slice at zero coordinates
angle of clockwise rotation. If the box Keep window open is ticked, you can apply
the changes by Rotate, the dialog will stay open and you immediately can rotate
the part again.
Similarly, slices can be scaled by drag drop or with help of the Manual
Transformation dialog box. Click on the center of the selection box edges and
drag them outwards or inwards to enlarge or shrink the slice. If you hold Ctrl, the
center of the slice stays in the same position. If not, the opposite edge of the selection
box keeps its coordinates.
With the option Scale in the toolbar or in the context menu, you can set specific
scaling factors for the X- and Y- axes and for the Z-axis. First, you get information
about the current selection, the part’s position, size and the scale center. Then enter
the scaling parameter: a scaling factor (e.g. factor 2 makes the part twice as big), by
a percentage or by defining the actual size. Slices are always scaled evenly in both
the X- and the Y-direction. With the Fix scaling ratio box ticked, the dimensions
of all three axes are scaled by an equal factor and consequently makes the whole part
bigger or smaller. If it’s not ticked, the values of X- and Z-axis can be changed. X-and
Y-axis will always be kept synchronous. If the box Keep window open is ticked,
you can apply the changes by Scale, the dialog will stay open and you immediately
can change the part’s size again.
The mirroring function can be found in the submenu Extended in the con-text
menu. As in the handling fuctions before, you can check the current
selection, its position and size. Then decide wether you want to mirror it along the
X- or the Y-Axis. Additionally, it’s also possible to define you own X- or Y-value
for a specific mirroring plane. The slices will be mirrored along the Y-axis and
placed in the same position as the original part. If you want it to be mirrored along

the X-axis, simply rotate the part by 180 around the Z-axis. To keep the original
next to the mirrored part, uncheck the respective box Remove original part. If you
want to make several changes after another, it’s recommended to Keep the window
open. Now apply the calculations by clicking on Mirror.
Figure 9.10: Dialog box for scaling slices
9.4.4 Merging and Grouping
When two parts or more are selected, the slices can be unified to one single part. The
original shapes will remain and can be seperated again later.
In the submenu Extended in the context menu, there’s the option Merge
Slices: The slices will become one slice file which includes all contours of the
original. Overlapping contours will remain.
With Clear grouping you can reverse this unification. And very importantly,
editing operations you conduct with slices, such as merging slices, can also be
undone by this function. Thereafter, the slice resulting from the operation is removed
and a new group is created which will contain the original slices.

EDIT SLICES (PRO FEATURE) 198
9.5 Edit Slices (Pro feature)
Many of these functions are also available in the three-dimensional data manage-ment.
However, in the Slice Commander, you have the advantage that calculations
are performed much quicker, as complex 3D-tasks are replaced by 2D-tasks. This
reduces the complexity of the data handling.
The result of editing slices can be seen when the box Preview Calculations at the
bottom of the tabsheet is ticked. However, this can require much calculation time
when you scroll through the slices. If Preview Calculations is not ticked, the origi-nal
slices are displayed until the calculations are applied.
The same calculations can be ultimately implemented by choosing Apply Cal-culations
in the context menu. Please note that calculations are applied auto-matically
when you export the slice.
As long as the calculations have not yet been applied, editing operations with
slices can be undone by selecting Clear grouping in the context menu. The
slice resulting from the operation is removed and a new group is created which will
contain the original slices.
9.5.1 Boolean Operations Removing Self-Intersections
If one part is selected that contains self-intersections, you can also remove them in
the slices. Or if two or more parts are selected, you can perform Boolean operations.
Find both functions in the context menu in the submenu Extended. If one part is se-lected,
you’ll find the Remove self-intersections button, if more parts are selected,
the Boolean Operation button will be displayed instead.
The Boolean Operation allows you to merge overlapping slices, create an
intersection, or subtract one slice from the other (figure 9.11).
A dialog box appears in which the selected slice files can be assigned to the two fields
Add and Subtract. At the beginning, all slices are in Add. If you click on a
slice and then click on the arrow pointing to the other field, the file is moved there.
If you click on the X, the selected file is removed.
To unify slices, all slices have to be in the left field Add. Execute the unification
with the button Boolean (figure 9.12).
For an intersection of selected slices, choose Create Intersection in the context
menu instead of Boolean Operation. The resulting slice includes only the overlap-

Figure 9.11: Top left: Two overlapping slices. Top right: A unification of those
slices. Bottom left: The intersection of the slices. Bottom right: One slice is sub-tracted
from the other.
ping sections of all selected slices (figure 9.12).
Figure 9.12: Left: Two overlapping slices. Center: Unify. Right: Intersection.
To subtract slices from others, you have to move those files you want to subtract
into the right field in the dialog box of the Boolean operations. The software creates
a unification of all slices in the Add field and subtracts the area of those slices in
the Subtract field from that unification. Overlapping areas are deleted (figure 9.13).
To immediately see the result of the Boolean operation, tick the box Preview Calcu-lations
in the tabsheet (=default). The calculations are applied automatically when
you export the file or with the function Apply calculations in the context menu (see
above).

Figure 9.13: Top: Settings for a Boolean Operation. The box shall be subtracted
from the cylinder. Bottom left: The two overlapping slices before the operation.
Bottom right: The resulting slice.
If triangles or surfaces of one part cut through each other, this is called a self-intersection.
Select the part, right-click and open the Extras-menu. With a
click on Remove self-intersections, you’ll split of the intersections and the new inner
shells and double surfaces will be removed. The outer surfaces are then reconnected
and a valid shell is being created.
9.5.2 Create Offsets of Slices
With the Slice Commander, you can create two-dimensional offsets of slices. They
can be used, for example, to compensate for expected inaccuracies during production
with a machine.

With the option Create Offset in the context and Extras menu, you can create
either an inner or an outer offset of the slice. It creates a new slice, of which
the layers are based on the shape of the original layers, only that they are placed
either within or without the original. In a dialog box, you can enter the preferred
distance to the original contours, you can edit the roundness for curves of the offset,
where it goes around corners of the original, and you can choose between an inner
or an outer offset (figure 9.14)
Figure 9.14: The dialog box for creating offsets.
This roundness is only relevant when it is necessary that the offset forms a curve,
which is the case with outer corners for outer offsets and with corners with a re-flex
angle for inner offsets (corners projecting inside). If the offset line lies on the
inside of the corner of the original, a new corner is created with an identical angle
(figure 9.15).
Figure 9.15: Inner and outer offset of original, blue slice.
The roundness angle represents the maximum angle of two adjacent points of the off-set,
with the original corner point as apex of the angle. Consequently, the offset curve

becomes rounder and more precise, if the maximum angle is reduced (figure 9.16).
Figure 9.16: Roundness 1 (left) and 90 (right)
When you click on OK, a raw offset is created. This consists only of hatches
parallel to the original hatches. netfabb also displays lines connecting the end points
of the offset hatches with the corner points of the original contour (figure 9.17). If
there goes around the outside of corners, the additional hatches connecting the open
ends (according to your roundness settings) are also added to the offset.
If Preview Calculations is ticked, a preview of the finished offset is displayed in-stead
of the raw offset. This offset is finished, if you apply the calculation in the
context menu. Calculations are applied automatically when you export the slice (see
above). So, you can wait with applying these calculations, which can take some time
and disrupt your workflow with complicated slice data, until you export.
Figure 9.17: Raw offsets

9.5.3 Point Reduction
This feature removes unnecessary points from a slice and thereby reduces the
data volume of the file. Often, these are points between hatches with a flat
angle, which possibly result from triangle edges on flat surfaces of three-dimensional
files (figure 9.18). At every place where a the slice layer comes across such a triangle
edge, a corner point is added and a new hatch is started.
Figure 9.18: Unnecessary points are removed.
You can see the points on your slice, when you activated the function Show points
(chapter 9.4.2).
netfabb calculates how far each point is from a potential hatch line connecting the
two adjacent points. If the distance is below a certain value, that point is removed
and the new line is inserted. The maximum distance of the old point to the new
line is defined by the maximum deformation you insert in the dialog box before
conducting the operation (figure 9.19).
Figure 9.19: Edit and confirm the maximum deformation in this dialog box.
The result of the point reduction can only be seen with the option Preview calcula-tions
the point reduction is not finally implemented, until you Apply calculations.

EDIT FILLING (PRO FEATURE) 204
When you export your slice, calculations are applied automatically.
This function has the purpose to reduce the complexity of slices, as the point reduc-tion
eases lengthy calculations during export and during production, often without or
hardly changing the actual shape (figure 9.18, 9.20). Round curves, however, may
be made less accurate, so you should take care not to fill in a too high maximum
deformation.
Figure 9.20: Here, the curve of the body is slightly less accurate after the point
reduction.
9.6 Edit Filling (Pro feature)
9.6.1 Create Filling
There are machines on the market, which can read your simply sliced files
and fill the part automatically. But there are also machines that need an exact
toolpath for the laser and therefore you’ll have to create a specific filling. Choose
Create Filling in the Extras submenu. With some production methods, you can
adapt exposure strategy during production without changing the actual shape of a
part.
In the dialog box, there are three hatch modes available. With the simple hatching
the slices will be filled with straight, solid lines. The Quad Islands mode devides
each layer into squares and filles them alternately with vertical and horizontal lines.

The third mode, the Stripe hatching, adds dashed lines as filling to the part. For
the simple mode, you can insert the Hatch distance (figure 9.21). To know the
correct distance, it is important to know the specifications of your machine. The
Quad Islands mode also requires the width and height of the quads. And for the
stripe hatching, determine the hatch distance, stripe width and stripe gap.
(figure 9.21)
Figure 9.21: The dialog box for creating a filling.
The angle determines the direction of the hatches, referring to the X-axis with a
clockwise rotation. Thus, if you leave 0, the hatches will be inserted along the
X-axis. If you insert 90, they will run along the Y-axis (figure 9.22).
The Rotation per Layer can be used to give the hatches of different layers different
directions. In that case, only the the first layer of hatches has the angle specified
above. After that, the angle changes with every layer (going upwards) by the degree
you enter here (figure 9.23).
If you increase the number for Filling only each ... layer, not every layer of the
original contour will be filled. If you insert 2, for example, there will be one filling
layer for every second contour layer.
Note: The Rotation per Layer refers to the filling layers, independently from the
number of contour layers in between.
The Translation per Layer determines, if and how far the hatches are shifted with

Figure 9.22: A round contour with filling: first, a filling with an angle of 0, then
with an angle of 45.
Figure 9.23: Two consecutive layers of the same slice file with a rotation of 20 per
layer.
each layer. If you insert zero, the hatches of the slice layers will be on top of each
other. If you insert 1.0, the hatch lines are upwards shifted by one mm with each
layer, going from the top to the bottom layer.
With the rotation and the translation per layer, you can avoid that the filling hatches
are exactly on top of each other. With some production methods, this could lead to
lower part quality and instability.
Some machines, for example metal sinter machines, require a specific direction the
laser traces the filling. The Sort type controls this tool path of the laser and you can
choose between the five options no sorting or to sort from right to left, from left to
right, from top to bottom and from bottom to top.

The filling is inserted as new slice file when you click on OK. It is treated as inde-pendent
object in the Slice Commander and in the project tree (figure 9.24).
Figure 9.24: Here, the filling is moved out of the contour as an independent slice.
9.6.2 Hatch cutting
Whenever a countour protrudes into a filling, you can cut the filling along this
contour: Select both parts, open the context menu, the Extras submenu and
click on Hatchcutting. As a result a new hatch file will be created. (figure 9.25)
Figure 9.25: Left: Blue contours protrude into the black filling. Right: Filling was
cut along the blue contours and results in two filling sections.

9.6.3 Convert contours/hatches
This feature is available in the submenu Extra in the context-menu. As
desribed above, there are Additive Manufacturing machines that automatically
fill your slices. If you decidedly don’t want any filling, it’s recommended to convert
the contours into hatches. The contours now behave like the hatches of a filling and
can’t be filled themselves again.
In the Hatch conversion dialog, you can perform the calculations either way: from
contours to hatches or from hatches to contours. A high accuracy creates an exact
calculation, but may lead to long calculation times.
It’s also possible to filter Contours/Hatches, which means that everything you have
selected will be checked for certain parameters and those contours/hatches that full-fill
the parameters will be copied. You can either preserve hatches and/or closed
contours. Open contours can be retained too, but if you want to actually build them
you’ll have to convert them into hatches afterwards.
Figure 9.26: Left: Part with hatches and contours, Right: after filtering with pre-serve
hatches
The function Connect Conours is compareable to the Stitching in the Repair mode
(see chapt. XX). Open edges that are lying close to each other will be connected.
With Filter Small Contours, very tiny and unnecessary countrous won’t be copied.
You can define the Minimum Contour Area in cmï£¡.

EXPORT AND SAVE SLICES 209
9.7 Export and Save Slices
If you right-click on a slice in the screen or in the project tree and choose
Export, you can save the slice as SLI, CLI, SLC, SSL, ABF, SLM, CLS,
USF, CLF, PNG, BMP, SVG, DXF or PS file. It is the last step before manufacturing
the part. The saved files can be read by 3D-printers and are built directly.
If more than one slice is selected, all selected slices are exported as one file.
You can choose a file type in the submenu of the Export option in the context menu.
After you click on a file type, a dialog box is opened where you can edit all export
parameters (figure 9.27). You can also change the file type again in that box.
Figure 9.27: The dialog box for exporting slices
At the top of the window, you can set the start height, end height and layersize. The
layercount resulting from these settings is also specified.
The start height and end height determine the exported section of the slice. So, you

do not have to export the whole slice, as you can leave out defined top and bottom
sections. If you choose a start height in the middle of the part, for example, only the
upper half will be exported.
The needed layer size usually depends on the machine you use for producing the
part. When you start the export dialog, the layer size of the file is automatically that
of your slice. If you know the necessary layer size when slicing the part, you should
use that size at this stage already.
If you insert a layer size different to the layer size of the slice, netfabb always takes
the last slice in the Slice Commander. So, if you have a slice with the layer size 0.1
and export it with layer size 0.14, the first layer (0.14) will be the same as the original
layer at 0.1, the second (0.28) will be the same as the original at 0.2, and the third
(0.42) will be the same as the original at 0.4. The original layer at 0.3 will be left out.
If you define a layer size below that of the original, some layers will be doubled.
Below, there are the specific export settings. At the top of this box is a dropdown
menu where you can choose the file type for the export (figure 9.28). When the
dropdown menu is closed, but still selected, you can also use the scroll button of
your mouse to change the file type. The file type you need depends on the machine
you use.
Figure 9.28: The format of the target file can be chosen in this dropdown menu.
After the file type, fill in a file name in the provided text field and choose a target
directory in a file browser after you click on the ... button.
The specific export settings necessary depend on the chosen file type:
For SLI (Slice Layer Interface) and CLI (Common Layer Interface), the specific
settings are the same (figure 9.29).
The units are length units for the calculation of slice contours, proportional to mm.
They determine the resolution with which the slice layers are saved. With a lower

Figure 9.29: The specific settings for exporting a slice to an SLI-file.
value, the layers will be more precise, but the calculation may take longer. You can
choose the calculation unit in a dropdownmenu or enter a unit manually (figure 9.30).
The resolution determines the maximum size of the exported slice. With a bigger unit
(and thereby lower resolution), you can export SLI files with a bigger outbox.
Figure 9.30: Choose the length unit for the calculation of the slice.
Below that, the coordinates dimensions of the outbox are specified. You can read
both the position and the size of the part in the X-Y-plane. In the first field are the
lowest X- and Y-values. In the second field are the highest X- and Y-values.
The maximum outbox is the restriction by the file type. It depends on the length units
you have chosen. The slice has to be within the boundaries specified here.
If the outbox of your slice is not completely within this area, the resolution is too
high / the unit too low, and the file cannot be written in the SLI or CLI format. In
that case, you will get a warning. With the button Fix Problem, the unit is set to the
lowest functioning standard value. However, it could also be enough to reposition
the slice, for example to move it to the origin (figure 9.31).
If the box Move Parts to Origin is ticked, the position of the exported parts is
automatically adjusted so that they start at the coordinates X=0 and Y=0. If it is not

Figure 9.31: If the slice file is too big to be written with the current resolution, you
get this warning.
ticked and the slices have negative X- or Y-coordinates, you get a warning. The SLI
and CLI file formats do not support slices with negative coordinates. You can solve
that problem by ticking Move Parts to Origin or clicking on Fix Problem (in
which case Move Parts to Origin is ticked automatically, figure 9.32)). If you do
not want the slice at the coordinates X=0, Y=0, you have to cancel the export dialog,
move the slice to positive coordinates and start the export again.
Figure 9.32: If a slice has negative X- or Y-coordinates, you get a warning and you
can move it automatically to X=0, Y=0 by clicking on Fix Problem.
For SLC files, you have dropdown menus to choose between the units mm or inch
and to choose either Part, Support or Web as SLC type (figure 9.33).

Figure 9.33: The specific settings for exporting SLC files.
For SSL (Stratasys Layer File) files, you have to choose which version of SSL files
you want to export: SSL V0 or SSL V20. If you have chosen SSL V20, you can tick
and untick the box Force open contours. If this option is activated, all contours are
interpreted as open contours and no filling is inserted during the print (figure 9.34).
Figure 9.34: The specific settings for exporting SSL files.
If you export ABF (Arcam Build Files) files, you have the options to calculate the
slices in memory and to use compression to create smaller files (figure 9.35). Cal-culating
slices in memory needs very much main memory and is not recommended
with very large files.
Figure 9.35: The specific settings for exporting ABF files.

For CLS (Concept Laser Slice Files), CLF (Common Layer File) and USF (Uni-versal
Slice Files), you can only change the file name and 1target directory and you
cannot edit any other specific settings.
The SLM format (Selective Laser Melting) requires specifications for the buildstyle,
laser focus, laser power and laser speed. To change those, open the SLM Export Set-tings
with a double click on any value in the table. Additionally, you can determine
the point dinstance and point exposure time. The output will be one .slm file.
Convert to model
When exporting into a model, the slice data are converted back into a triangle mesh.
When you choose convert to model in the context menu, an own dialog box is
opened, in which you can edit accuracy and refinement, and you can choose to
smooth the result (figure 9.36). The accuracy determines the preciseness of the cal-culation.
For the export, which raster cells in a three-dimensional raster are occupied
by a slice layer. Those cells will be part of the STL. With this procedure, you get
an effect of steps in the part as big as the accuracy/rastersize and the file might need
very much triangles. Thus, even small and simple parts may have a huge data vol-ume.
Refinement and smoothing are measurements against this steps-effect. To make
sure that bottom and top are closed, check the respecting box.
Export Image Files
If you export a slice as image files or vector graphics, netfabb creates an image of
each slice layer, either as SVG, DXF, PNG, BMP or PS file. Each layer is exported
into a separate image file (figure 9.37).
In the specific export settings for SVG (Scalable Vector Graphics), BMP (Windows
Bitmap) and PNG (Portable Network Graphics) files, you can choose between two
registers, one for the export target and one for export parameters.
For the Export Target, you first have to choose in a dropdown menu, if you want to
copy the image file in a directory or if you want to save them in a TAR or ZIP archive
file. Then, fill in a file name, which will be supplemented by the layer number of
each image file, and choose a target directory (figure 9.38).
When exporting SVG files, these are the only options for the export target, but for
PNG and BMP files, there are several other options:

Figure 9.36: The dialog box for exporting slices as models.
Figure 9.37: Left: A slice file on the screen. Right: The depiction of the same slice
layer in a PNG-file.
Below the field for entering your file name, you can change the resolution and the
size (in pixels) of the slice images. Those two settings depend on each other, and if
you change one, the other is adjusted automatically.
If the box Enable anti-aliasing is ticked, you will have reduced alialising and raster
effects in you image files (figure 9.39).

Figure 9.38: The settings for the export target for image files.
Figure 9.39: Left: An exported slice as png without aliasing effects. Right: The
equivalent image with enabled anti-aliasing.

If you tick the box Use Advanced Properties, additional options become available:
You can change the size of the whole image either by inserting a pixel size manually
or by choosing a standard size after clicking on the ... button. This does not have
any influence on how big the slice is depicted. However, if you change the size of
the slice depiction above, the height of the entire image is adjusted to the new height
and the width is scaled proportionally.
Figure 9.40: In the colored field, you can adjust the position of the slice in the image.
After setting the image size, you can change the position of the slice depiction on the
image. In the Position field, the background is drawn blue and the slice is illustrated
in orange. You can simply move the slice around by drag drop” (figure 9.40).
To the right, you can see the distance between the slice depiction and the frame of
the image. The fields Left and Top specify the number of pixels from the left and
top side of the whole image to the slice depiction. If you enter new values here, the
position of the slice is adjusted accordingly. If you click on Center Image, the slice
is moved back into the center of the image. If you create an image which is smaller
than the slice depiction or if you just move the slice across the edge of the image, it
is possible to export only a section of the slice into your image files.
In the export parameters (figure 9.41), you can choose how your slice shall be
depicted and which colors the images will have. You can tick boxes whether you
want to include closed contours, the filling of closed contours, and lines along open
contours and hatches. For the lines, you can enter the thickness with which they are
drawn in the image (figure 9.42).
Furthermore, after clicking on the ... button on to the right, you can edit the color of
all elements of the image as well as the background color (read more about changing
colors in chapter 10.2).
When you export SVG files, the filling and the background are always white and

Figure 9.41: The settings for the export parameters for image files.
cannot be changed.
Figure 9.42: Left: A slice image with grey background, where only the closed con-tour
is visualized. Right: Here, the contour is filled and a different color is assigned.
For DXF (Drawing Interchange Format) files you can only choose to export either

separate files, a TAR archive or a ZIP archive in the dropdown menu and select a
target folder (figure 9.43).
Figure 9.43: The specific settings for exporting DXF files.
For PS (Adobe Postscript) files, all images are saved in one file, with one page per
layer. You can choose, if the inside or the outside of the slice is black (with the box
Inverted) and you can choose either the portrait or the landscape page format as
orientation (figure 9.44).
Figure 9.44: The specific settings for exporting PS files.

GENERAL SETTINGS 220
Chapter 10
Settings
Settings for netfabb can be altered in the Settings menu. General settings concern all
kinds of aspects of the software, including the coloration of all visualizations, and
can be changed in a separate window, if you choose Settings. If you click on Edit
File Associations, you can choose which file types shall be linked to netfabb.
Figure 10.1: The settings menu
10.1 General Settings
The settings for netfabb can be changed in the Settings menu. After clicking
on Settings, a window appears where settings for many different aspects of
the software can be altered (figure 10.2). The settings can either be changed in a
dropdown menu, by insertion of values or names, or by opening a dialog box with a
double-click on the current setting.

Figure 10.2: The Settings window
List of General Settings
Admin Settings:
If you are registered to your computer as administrator, you are able to change the
general administrator settings regarding Proxy-Settings and License Settings (see
below). Furthermore, you can choose to disable online updates. If they are disabled,
the green point in the bottom left corner of the netfabb window turns red. You will
not be notified in case a new netfabb update is available and no user will be able to
conduct the update.
Language:

Current available languages are English, German, Russian, Czech and Chinese.
Unit of Length:
In this dropdown menu, you can choose between mm and inch as standard unit of
length for your netfabb installation.
Show Icons in Menu:
If you deactivate this option, no icons are shown in the menus and context menus of
netfabb. Shown icons are always to the left of the menu functions.
Proxy Settings:
In the proxy settings, you first have to choose, if you want to use admin settings or
not. If you do so, the settings can only be changed by the administrator in the admin
settings at the top. If not, you can change the proxy settings here.
You may need an internet connection for updates or accessing the netfabb online help.
If your internet connection is based on proxys, you can change your Proxy-Settings,
Proxy-Server, Proxy-Username and Proxy-Password in the respective fields. If you
have a direct internet connection, the other proxy settings are not necessary. If you
have a Proxy server without authentication, no username and password have to be
entered.
License Settings:
In the license settings, as in the proxy settings, you first have to choose, if you want
to use admin settings or not. If you do so, the settings can only be changed by the
administrator in the admin settings at the top. If not, you can change the license
settings here.
A dongle is required to validate your currently used license. Without a dongle, you
will not be able to use any features restricted to netfabb Professional and you can
work only with the functionality of netfabb Basic. If you use the Dongle type Net-work
dongle, you have to enter the Dongle address in the field below. This is the
address of the server where your network dongle is plugged in. You have to be con-nected
to this server in a network. Please note that only one computer in the network
can access a dongle with a single license at one time. If you use a local dongle,
this dongle must be plugged into your local computer to ensure that you have all
Professional features.
Below, you can choose the location of your license file. By default, this is the user
directory of the administrator (usually, this is User/AppData/Netfabb/License.dat).
Alternatively, you can set the application directory, which is the directory where net-

fabb is installed, or a custom directory, which you can choose in the setting below.
Whenever you license your netfabb installation (by opening the license file with net-fabb
and restarting the software), the license file is copied automatically into the right
folder.
Crash Logger:
If you run accross any errors, the Crash Logger provides further information. A small
extra tool is required though, please contact support@netfabb.com.
iPhone Settings:
Here you can set whether or not you want to listen automatically for iPhones. If
you choose Yes, you will automatically be notified, if an iPhone with a netfabb
installation tries to connect with your netfabb. In the field below you can enter the
name which your netfabb will have in that network.
To connect netfabb with smartphones you need a wireless internet connection.
Online Update Enabled:
Here, you can choose to enable or disable online updates. This is only possible, if
online updates are not disabled in the admin settings. You are only notified of a new
update and you are only able to conduct an update, if online updates are enabled.
If the online updates are enabled, the point in the bottom left corner of the netfabb
window is green, if they are not enabled, it is red.
Platform size:
The size of the platform is best adjusted to the size of the build platform in your
machine.
Always use file preview:
If you select Yes, the File Preview Browser will start every time you want to open
a file.
Automatic check for erroneous parts:
If you do not always check for parts with errors, there will not be any warning signs,
if you have damaged or faulty parts in your project.
Resolve Windows Link File Names This setting determines the naming of parts
which are opened with a .lnk link file that links to a 3D file. If it is inactive, the part
in the project will be named as the .lnk file, if it is active it will be named as the 3D
file.
Ask for saving while deleting part:
If you remove a part, netfabb will ask if you’re sure about this.

Restore LOD after Project Loading:
Whenever working with a lower Level of Detail in order to speed up processing, it’s
possible to save it and continue working with this LOD next time.
Confirm after project saving:
If this option is activated and you save a project, you’ll get a confirmation when the
process has been finished.
Use Advanced file import:
If this is activated, a dialog box appears where you can change the settings for the
import and stitch, scale and duplicate parts (see chapter 3.2.2).
Default Folders:
By double-clicking on one of the folders (default: use last path), you can change the
folder which netfabb automatically opens when you start looking for files you want
to add to your project (figure 10.3). In a windows installation, the Setting Use last
path is restored, when you select My Computer.
Figure 10.3: Change the default folders after a double-click.
Display Settings
Strength of background gradient:
In your background, there is a color gradient gradually changing from bright at the
top of the viewing screen to dark at the bottom of the viewing screen. The default
color is white, which becomes grey at the bottom.
Use enhanced display functions (OpenGL3):
The enhanced display functions enables a prettier rendering of the parts. If you have
troubles with displaying you parts, set this function to No.
Level of detail:
Use the simple mode for quicker calculation or the advanced mode for a more precise

view of the part.
Highlight center of platform:
If you choose Yes, a large X will indicate the center of the platform.
Coordinate System:
The coordinate system in the bottom left of the viewing screen, can be altered in
size. If the planes are shown, their minimum and maximum size, as well as their
thickness can be specified. The size of the planes in the program varies between the
minimum and maximum value, depending on the current perspective, with planes in
the background always displayed larger than those in the foreground. The planes, if
displayed, can be used for changing the perspective.
Slice Commander
In case you visualize the prehatches of slices with the option Show Filling (chap-ter
9.4.2), you can edit the distance of the grid lines here. Additionally, you can
choose if you want to have grid lines along the X-axis, the Y-axis or along both axes
(figure 10.4). Also, you can edit the default tolerance for point reductions (chap-ter
9.5.3). You can also edit the tolerance at every single point reduction.
Figure 10.4: The prehatches of a slice with grid lines along both axes (left) and grid
lines only along Y-axis (right).
Parts Library
In the Parts Library Section, you can edit the default settings for all parameters of all
primitive objects you can add to the project (see chapter 5.3).
Part Repair
For the part repair (figure 10.5), it is possible to change the default stitch tolerance.
You do not necessarily have to use that value for the stitching of triangles, as you can
set the tolerance for every single stitching.

The minimum edge length for good faces determines which triangles are defined
as degenerated in the repair module. All triangles with a height lower than this
value can be displayed in orange and are deleted with the function Remove degen-erate
faces (see chapter 7.5.7) the orange highlighting of degenerate triangles in the
repair module. Triangles with an edge shorter than the specified value are marked
(figure 10.5).
Figure 10.5: The settings for the repair module.
Measuring
For the measuring, you can choose in dropdown menus, which measuring mode and
which option for setting anchor points shall be set when you start the measuring
module.
Part Renaming
The part renaming determines the name parts get automatically after they are modi-fied.
The name of the original is always part of the new name. To change renaming
settings, double-click on a function in the list, or click on the button ... which ap-pears
to the right of the function after you click on it once (figure 10.6). A dialog
appears to change the automatic renaming. You can insert what will be added before
or after the part name in the text fields left and right of part name. Below, you
can see a preview of how your parts will be named. Part name always refers to
the name of the original part. With the button Set to defaults at the bottom of the
dialog, you can restore the default naming for that particular function (figure 10.7).
The default setting for repaired parts, for example, is that (repaired) is added to the
original part name.
Create Hollow Part, Inner Offset, Outer Offset and Hollowing Shell refer to
the respective options for the function Create shell. Group of shells of one part

Figure 10.6: The list of functions for which the automatic part renaming can be
altered.
and Group of shells of multiple parts stand for the group names of the groups into
which the shells are moved with Shells to parts. Similarly, Group of cut parts
refers to the group into which cut parts are moved.
For functions which may create several parts at once or which process several parts
at once, such as Duplicate, Shells to Parts, Cut parts and Merge parts, there is
the additional field XX. This is only enabled, if the box below is ticked. If several
parts are created at once, the XX stands for a number which will be inserted for
each part name (figure 10.7). If you duplicate a part, for example, the copies will by
default be named Part name_c00, Part name_c01, Part name_c02 and so on. If
several parts are processed by a function, the XX stands for the number of parts
processed, as for example in Merge of 2 parts.
Any changed renaming options are written in italic letters.

CHANGE COLORS 228
Figure 10.7: The dialog box for changing the automatic renaming for Shells to
parts.
If you click on the last line Defaults, a button appears with which you can restore
the default naming settings for all functions.
10.2 Change Colors
The color can be changed in netfabb for parts, slices and many other objects and all
kinds of visualizations. They are always changed in a dialog box, which provides
every shade of every color of the whole spectrum. For parts and slices, the color can
be changed via the context menu or the menu bar. Other colorations are changed via
dialog boxes or in the settings.
In the dialog box for changing the color you have several options (figure 10.8):
Firstly, you can click on a basic color. These are part of the installation of the
software. Secondly, you can click anywhere on the spectrum to the right and the
respective color is chosen. Then, you can alter the brightness in a bar to the right.
That way, any color can be created. If the brightness is at the top or bottom of the
bar, the color will always be white or black.
Below the spectrum, in the field Color|Solid, the color you have chosen is displayed.
Next to that field, values of the hue, the saturation, the lumination and the intensity
of red, green and blue are specified. The values are adjusted automatically when
you change the color, but you can also change the color here by manually entering
new values. The change of color is confirmed, when you click OK.

CHANGE COLORS 229
Figure 10.8: The dialog box for changing colors.
To create user-defined colors, click on one of the custom colors. After installation,
these are all black. Then, choose a color in the spectrum and define its brightness.
Finally, click on Add to Custom Colors to insert the color into the custom color
field you have selected.
In the settings, you can edit the default settings for every kind of coloration by
double-clicking on the respective color. This includes the background in the viewing
screen, the platform, collisions, cuts, the planes and origin of the coordinate system,
the color of selected parts and of backfaces, the coloration of parts during Boolean
operations, the default colors for added parts, the preview and backface colors for the
File Preview Browser and the iPhone part and backface color.
In the Slice Commander settings, the colors for the background and the default colors
for added slices in general can be set.
In the Part Repair settings, you can change the color of the outside and inside
of both unselected and selected faces, of boundary edges, degenerate faces, self-intersections,
double surfaces, edges, the triangle mesh, as well as the preview of
a surface and selected edges when adding triangles, the face preview and the edge
preview when adding nodes and the extrusion lines and the extrusion in the feature
Extrude Surfaces.

EDIT FILE ASSOCIATIONS 230
Figure 10.9: In the settings, every kind of coloration can be altered.
For the measuring and the test module, you can set the color of tested measurments
and values that are within or without your tolerance (test module), the part in the
screen, the lines and the faces of previewed values in the screen and the text and the
background of the measuring point.
10.3 Edit File Associations
File associations can be changed via the Settings menu. Here, all file types
selected by ticking their box on the left are automatically linked to netfabb. If
you open a file with such a file type, a new netfabb window opens containing the file.
You can also activate (All) or deactivate (None) all file types at once or you can
reset your settings to the original status. Settings must be saved to become active.
You can save them for all users or only for yourself (figure 10.10).

EDIT FILE ASSOCIATIONS 231
Figure 10.10: The file associations window

INDEX 232
Index
3D-Extrude, 165
Active slice file, 186
Add nodes, 139
Add note (measuring), 176
Add part, 22, 49
Add triangles, 139
Add value, 181
Advanced file import, 24
Advanced part selection, 51
Advanced triangle selection, 138
Align to bottom plane, 61
Analysis, 78
Anchors, 167, 170, 172
Apply calculations, 193
Apply repair, 130
Arrange Parts, 65
Automatic Packing, 66
Automatic Packing Medium and Large,
69
Automatic Packing Small, 67
Automatic repair, 151
Boolean Operation with slices, 193
Boolean operations, 105
Boolean operations Removing self-intersections
with slices, 193
Border Edge, 3
CAD Import, 31
Center of gravity, 81
Center View, 39, 41
Change color, 70, 223
Change color of group, 71
Clear grouping, 192, 193
Clear selection (repair), 135
Close all holes, 142
Close hole, 142
Close line (Cut surfaces), 158
Close trivial holes, 142
Collision detection, 75
Colors, 47
Context menus, 15
Convert contours/hatches, 203
Convert units, 85
Create definition, 179
Create filling of slice, 199
Create group, 70
Create group with selected parts, 70
Create intersection, 106
Create intersection of slices, 193
Create new group, 12
Create offset of hole edges, 160
Create offset of slice, 195
Create shell, 86
Cut parts, 89
Cut surfaces, 157
Cutting Line, 90, 170

INDEX 233
Cutting line, 99
Cutting options, 103
Cutting plane, 90, 93, 98, 99, 170
Detect self-intersections, 144
Duplicate part, 57
Duplicate slice, 186
Edge, 3
Edit file associations, 225
Edit Filling, 199
Edit measuring point, 169
Edit Slices, 193
Estimate direction (Extrude surfaces),
165
Expand selection, 138
Export part, 33
Export Project to STL, 32
Export slice as image files, 209
Export slices, 204
Extract selected triangles as part, 148
Extrude surfaces, 161
File formats, 17
File Preview Browser, 26
Filter noise shells, 108
Fix flipped triangles, 146
Flip selected triangles, 141
Free cut, 93
Global information, 186
Groups, 70
Hatch cutting, 202
Hide all parts, 43
Hide Group, 71
Hide part, 11, 43
Hide selected parts, 43
Hide slice, 189
Hide unselected parts, 43
Highlight backfaces, 44
Highlight errors, 132
Highlight holes, 132
Highlight part, 39, 43
Hollow part, 87
Hollowing shell, 87
Inches to mm, 85
Insert to mesh (Cut surfaces), 159
Invert part, 84
Invert selection, 51
Invert visible parts, 43
Isometric perspective, 40
Level of detail, 43
Live Collision Detection, 76
Lock view, 178
Measure angle, 174
Measure distance, 172
Measure radius, 175
Measuring point, 168
Merge selected parts, 86
Merge slices, 192
Mesh viewer, 47
Mirror, 84
Mirror slice, 191
mm to inches, 85
Models, standard, 54
Move cutting plane, 95, 98
Move nodes, 140
Move parts, 13, 59

INDEX 234
Move points (Extrude surfaces), 162
Move slice, 190
New, 22
New measuring, 167
New test, 178
Offset, 87
Open, 22
Open slice file, 185
Outer offset, 87
Perspective, 12, 39
Platform overview, 73
Platform, new, 74
Point reduction, 198
Polygon cut, 99
Preview calculations, 187, 193
Print, 36
Redo, 22, 131
Reduce triangles, 154
Refine triangle mesh, 153
Refresh shells, 137
Remove all empty groups, 71
Remove degenerate faces, 148
Remove double triangles, 147
Remove groups, 71
Remove measuring point, 169
Remove part, 49
Remove selected triangles, 141
Remove self-intersections, 145
Remove slice, 185
Rename groups, 71
Rename part, 70
Renumber parts, 72
Repair scripts, 151
Report, 29
Reset line (Cut surfaces), 158
Rotate cutting plane, 95, 98
Rotate parts, 13, 60
Rotate slice, 190
Save, 32
Save As, 32
Save Screenshot, 37
Scale parts, 64
Scale slice, 191
Screenshot to Clipboard, 36
Select (repair), 134
Select all parts, 51
Select all triangles, 135
Select attached triangle only, 138
Select no part, 51
Select Overlapping Triangles, 148
Select parts, 11, 49
Select shells, 134, 136
Select shells with negative volume, 138
Select slices, 187
Select surfaces, 134
Select surrounding triangles, 138
Select this shell, 134
Select this surface, 134
Select this triangle, 134
Select triangles, 134
Selection rectangle, 134
Selection tolerance, 135
Self-Intersections, 6, 142
Self-intersections in slices, 195
Set cuts with mouse, 90
Set default modes (measuring), 177

INDEX 235
Settings, 215
Shadow Area Analysis, 83
Shell list, 136
Shells to parts, 86
Shift (Extrude surfaces), 164
Show all parts, 43
Show anchors, 172
Show degenerated faces, 132
Show edges, 44
Show edges from..., 132, 135
Show filling, 189
Show Group, 71
Show outbox, 189
Show part, 11, 43
Show part names, 46
Show part numbers, 72
Show platform, 45
Show points, 189
Show points on cut, 91
Show selected parts, 43
Show slice, 189
Show triangle mesh, 46, 132
Shrink selection, 138
Simple Cutting, 89
Slice animation, 186
Slice output for EOS, 69
Slice selected parts, 183
Smooth triangles, 156
Sort type, 201
Split large STL file, 28
Split non-oriented edges, 149
Split off self-intersections, 144
Standard Analysis, 80
Standard perspectives, 40
Status (repair), 130
Stitch triangles, 145
Subtract parts, 107
Subtract slices, 194
Tabsheet, 16
Test, 178
Text result, 181
Texture, 47
Toggle selection (repair), 135
Toolbar, 15
Triangle Edge, 3
Triangulate cut, 104
Undo, 22, 131
Ungroup, 71
Unify parts, 106
Unify Slices, 193
Unify slices, 193
Unlock view, 178
Upskin and Downskin Analysis, 80
Use plane boundary, 104
Wall thickness, 82
Wrap part surface, 150
Z-Compensation, 155
Zoom, 13, 41
Zoom on part (repair), 132
Zoom on selected slice files, 189
Zoom on selected triangles, 132
Zoom to all, 42
Zoom to all slice files, 189
Zoom to parts, 41
Zoom to platform, 42
Zoom to selected area, 42

INDEX 236
Zoom to selected area (slices), 189
Zoom to selected parts, 42
Zoom to selection (repair), 132

Netfabb basic documentation

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Netfabb basic documentation