Diy 3d scanning for 3D print - Makerfest India
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This document provides an overview of DIY 3D scanning techniques for 3D printing, including types of scanning methods and instructions for setting up Kinect and DAVID scanning. It also outlines the file preparation workflow needed to repair scanned files, including filling holes, smoothing, and fixing geometry issues, in order to produce a watertight STL file suitable for 3D printing.
Diy 3d scanning for 3D print - Makerfest India
- 1. DIY scanning for 3D printing: an overview Sophie Kahn, Natalia Krasnodebska and Lauren Slowik
- 2. Why 3D scan? 3D scanning brings real-world objects into the digital realm -Save modeling time -Scale up or down -Modify or remix objects -Output them in different materials, using different technologies (3D printing, CNC milling, etc)
- 3. Types of 3D scanning -Laser line -Structured light -Photogrammetry -Time-of-flight -Contact
- 10. To create a Kinect scanning setup -Office chair that spins -Bright lamp -Microsoft Kinect v1 or v2 -Kinect drivers and SDK -Skanect software
- 12. DAVID laserscanner You will need: -Focusable laser diode and battery pack, or laser level from a hardware store -Webcam: the higher res and faster fps the better (I use The Imaging Source) -Printed calibration panels -Cardboard/plywood -Set square
- 13. DAVID structured light You will need: -Pico projector -Calibration panels -Webcam (the higher-res and higher fps, the better) -Small desktop tripod -Dual head for tripod -Two rotating ball tripod mounts -Turntable (optional but helpful)
- 14. -White spray paint or removable spray powder (talc developing spray, dry shampoo) -White play-doh for registering multiple scans -Black spray paint -Black painted blocks to serve as props -Helping hands tool -Black velvet to mask out background Useful accessories for 3D scanning small objects:
- 15. Steps to make a DAVID scan -Set up calibration panels at 90 degrees, using a set square for accuracy -Calibrate camera -Prepare and stabilize your object -Scan in sweeps, rotating object and flipping as needed -Register scans in DAVID Shapefusion -Fuse surface and export
- 16. Repairing files for 3D print
- 17. What does a 3D printer need in a file? -File must be “watertight” (one solid form, no holes) -File must have no geometry errors (all polygons face same way, etc) -File must be correct thickness -File must be structurally sound
- 18. Workflow to prep scan for 3D print -Fill holes in scan file & make solid (Meshmixer) -Smooth and sculpt (Meshmixer) -Repair geometry (Netfabb) -Export .stl for printer (Netfabb)
- 21. Fill holes in Meshmixer: Edit->Close Cracks Edit->Make Solid
- 23. Steps to repair in Netfabb Basic -Fill any remaining holes using rt- click->Fill Hole -Remove unnecessary shells -Run basic repair & apply -Trim object and removed trimmed parts if necessary -Fix any bad geometry by deleting and re-adding triangles -Run basic repair one last time -Export as .stl
- 26. Additional steps in Netfabb Pro -Wrap part surface if object is severely corrupted -Reduce triangle mesh to <1,000,000 polygons -Hollow model to desired wall thickness -Add drain holes using Boolean operations -Run wall thickness visualization to check structural integrity