Forget 3D Printing, What the Heck Is 4D Printing?

You gotta know when to fold 'em.

Forget 3D Printing, What the Heck Is 4D Printing?

Printing in "4D" might sound like something cooked up for a sci-fi novel, but it's actually a real object printing technique that builds on what's already possible with current 3D printers in mind-bending ways.