I tossed my hat in the ring with "Lefty, the One Armed, Three Legged Butler Bot", but the video leaves open a multitude of questions, among them:
1) Ballpark weight and size? Ballpark speed and torque?
2) What kind of mechanical and electrical connection exists at the "hand"?
3) I assume if you could 3D print with this it has a high degree of accuracy. Is that so?