Richard Van As, a South African carpenter, lost four fingers from his right hand to a circular saw two years ago. He was unable to afford the tens of thousands of dollars to get a myoelectric hand, which detects a muscle's electric impulses to activate an artificial limb.
Enter Robohand — a device that Van As and Owen invented that is made from cables, screws, 3-D printing and thermoplastic. It uses the rotation of a joint to enable five plastic digits to grasp. The device looks like a robot's hand in a science fiction movie, costs about $500 to make and can be reproduced using plans on the Internet and a 3-D printer.