Therapy3D designs practical Occupational Therapy and Physical Therapy tools for patients and therapists. STL files are free for personal and therapeutic use. For those without access to a 3D printer, see our .com site. About the Designer: I’m a retired computer engineer, and after my wife became disabled, we both found ourselves needing OT and PT rehabilitation support. That experience inspired me to begin designing 3D‑printable therapy devices that can be used at home or in clinical settings.