The GTUB project developed a toolkit for upper extremity prosthetics that aims to standardize expertise, ensure reproducibility, and make design accessible to all occupational therapists. The toolkit is intended to start with simple pieces that are easy for therapists to use and adapt to patient needs. It has been published online through sites like Thingiverse and Instructables to allow broader access. Case studies demonstrate prosthetic adaptations like a knife and mouse. The project brings together partners from UGent, Howest, occupational therapists, designers, and patients in cocreation.