This pen with plastic ink draws in 3D!! And you can buy it soon!

The 3Doodler, invented by Peter Dilworth and Maxwell Bogue, gives people a freer hand in creating sculptures and brings computer-aided design software front and center.

You hold it just like a regular pen, but instead of building a shape layer by layer, as a 3-D printer does, this pen it extrudes the plastic into the air.

The plastic is soft when it is extruded, but it hardens quickly enough that it can form a stable structure. It’s the same kind of plastic (called ABS) that is used in 3-D printers. The pen is hooked up to the supply of plastic, which comes in the form of long, thin strings, so it has a kind of tether on it. It doesn’t need a computer or any software to work.