PC Magazine (March 6) -- Even when it's moving at a slow speed, Rohit Bhargava's 3D printer in action is mesmerizing. As the pointed tip of the printer head moves, it extrudes a thin, shining tube of what looks like plastic. The nozzle moves away and draws out another tube. Then suddenly they're connected; joined by other tubes to become a complex three-dimensional shape: A tiny, anatomically accurate replica of a heart.