There’s a lot you can make with a 3D printer: prosthetics, corneas, firearms — even an Olympic-standard luge. You can even 3D-print a life-size replica of a human head — and not just for Hollywood.

You’ve seen it in movies and shows — the hero takes a blurry still picture, and with a few keystrokes, generates a view from a different angle or sometimes even a full 3D model. Turns out, thanks to ...