Six Rings to Find Them

Ultimaker 2 3D pprinter trailing fine plastic filament at 200 Celsius, rapid prototyping rings conceived for physical therapy for finger tendon damage, and modeled with Autodesk Tinkercad . The creativity shown by libraries evolving to remain useful and relevant resources is impressive. Use them! Tinkercad is not industrial strength, but it's free. I've got my own account now!

 

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Done