Kinetic Finger (Improved)

A friend who recently lost a finger in a woodworking accident contacted me, asking if I could print Mat Bowtell's brilliant "Kinetic Finger" for her. During the process of printing, assembling, and testing the device I came up with some improvements making both assembly and operation easier.

I found it very difficult to install the TPE hinges into the PLA phalanges, using Mat's models. This may be due to printer or settings variations, but I'm using a Raise N2, which is generally regarded as fairly accurate. In any case, I solved the problem by enlarging the holes and slots in the phalanges into which the hinges go, and now it's very easy. I also slightly enlarged the hole in the distal phalanx into which the rubber grip "post" is inserted to ease assembly. We found that the "ring finger" phalanx works better for her, so I haven't modified the "index finger" model.

In testing the first iteration using the hinge models as published by Mat, the subject had a lot of difficulty closi