Here is an affordable bionic arm that connects to your smartphone to let you perform tasks. When your nerves and muscles move, the hand and fingers move. Your smartphone takes care of communicating with the bionic arm. It uses 3D printed parts and can be reprogrammed to do different maneuvers.
More gadgets like this: here
exiii presents their 3D Printed Prosthetic hand, called handiii, at SXSW 2015
Since the Exiii Bionic Arm is 3D printed, you can change the design. The above videos should give you a better idea how this bionic arm works.
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