Meet the Youbionic Hand: a 3D printed prosthetic hand that was printed in one piece and can be controlled using muscle sensors. According to Federico Youbionic, the hand is driven by Arduino and a bunch of servos and sensors. The goal here is to replace or support a limb.
To get started, simply wear the hand and attach the electrodes. Turn on the switches, flex your muscles several times, and you are on your way. Pretty impressive, don’t you think? More info is available here.