When Sol Ryan was born, doctors ended up having to amputate his lower left arm, leaving him with about an inch of his lower arm remaining. His parents were told that he would have to wait a year before he could be fitted with a nonfunctional, cosmetic-only prosthetic, and three years before the National Health Service could provide a functional myoelectric prosthetic. Sol's father, Ben Ryan, decided that such a long wait was unacceptable, so he designed and 3D printed a hydraulic prosthetic arm himself. Lightweight and controllable without batteries or electronics, Ryan's invention is optimized for infants and unlike any other prosthetic available, so he began a company called Ambionics so that he can offer the device to healthcare providers around the world. Read more at 3DPrint.com: http://3dprint.com/166512/3d-printed...ic-prosthetic/