Arm Spork

thingiverse

This is a cuff/spork for a little boy who is missing all his extremities. This spork allows him to feed himself. It fits over his nub (left arm, in this case), with a slot milled out for a "thumb" he has on his forearm. He can take the utensil off and on by himself. While this design is specific to an individual, the general principle could be used by other people.