Tomorrow we're going to start experimenting with 3D printed prosthetics. We will be playing with the open source file for "Robohand," generously made available by Richard Van As and Ivan Owen. Our hope is to modify the design for a future workshop, to collaborate with kids who were born without fully developed hands and their siblings. We are grateful for the help and input of mechanical engineer Ky Krieger, who specializes in prosthetics and exoskeletons. If we can make this project feasible for a workshop, its potential is quite compelling: ownership and identifications of self, engineering and 3D printing technology, collaboration, empathy, the iterative process, and creative problem solving. First steps first: build the prosthetic hand.