A new 3-D printer builds temporary electronics on your skin

You won’t mess up the machine’s design, even if you twitch

3-D printed wireless light-up device on a hand

ON HAND  A new 3-D printer creates wireless, light-up devices (one shown) or health sensors directly on a person’s skin, like high-tech temporary tattoos.

McAlpine Group/University of Minnesota

A new 3-D printer draws precise patterns of electrically conductive material directly on a person’s skin, creating temporary, tattoolike electronic devices.