3D printing is making robotic limbs more accessible to people. Take the new Youbionic Hand for instance. It is a 3D printed modular hand with improved mechanical elements that can perform all movements that a human hand can accomplish. It can be controlled by an Arduino microcontroller.
The Youbionic hand can be controlled with a MyoWare sensor. It has a 12000mAh power bank. The hand was printed in PLA. It is Arduino IDE compatible.