That was all the encouragement Schull needed. He soon created e-NABLE, which provides resources for printing hands, and connects volunteer makers with those in need of prosthetics. The process of creating a hand is relatively straightforward: The recipient enters his or her measurements into e-NABLE’s free “Handomatic” software. Based on this information, a 3-D printer can easily churn out the necessary plastic parts for a fitted version of a tried-and-true model like the Raptor Hand. With a little more effort, makers can create their own specialized hand designs.