Solo Finger Pen

UPDATE: 3-19-17
New model files have been posted. They are now sized as millimeters. The previous models were posted as inches.

This mechanical finger can be a lot of fun to play with, but can possibly serve as prosthetic for someone with missing a thumb or other fingers. Additional parts needed: a basic flexible "BIC" pen insert. Four (4) M3 x 10mm screws with washers. Other small screws may be substituted.