This Tiny 3-D-Printing Pen Lets You Draw Things Out Of Thin Air, And Here's How It Works

A lot of people want to get their hands on a 3-D printer. They either want the cheapest or the fastest. But what about the smallest? The Lix Pen is a 3-D-printing pen that lets you draw objects out of thin air. It's similar to the 3Doodler, which launched a Kickstarter last year, and raised more than $2 million.  But the UK-based Lix Pen is billing itself as "the smallest 3D printing pen in the world." Indeed, it's only 0.55 inch at its widest, and it's only around 6.5 inches long. (The 3Dood...