3D printer uses light to create structures in one piece

      

A team of researchers from the University of North Carolina at Chapel Hill have unveiled a 3D printer that uses light to create an entire object at once.

 It's called the Replicator, named after the machines in the Star Trek universe that can synthesize food, water, air and various objects seemingly out of nothing. Before you get too excited, the researchers didn't quite create an exact replica of that fictional machine, but it still offers a new and promising 3D printing technique.

According to the team's paper published in Science, the Replicator works like a reverse CT scan. When a patient undergoes the procedure, an X-ray tube rotates around their body to take multiple photos that a computer can use to create 3D images. The Replicator, on the other hand, starts with a 3D model, which is then uploaded to a computer to help the researchers come up with 2D photos of it from every angle. Those 2D images are then fed to a slide projector used to cast images onto a cylinder filled with a synthetic resin called acrylate.