The 3Doodler is an unusual device that its creators, WobbleWorks, Inc., bill as the world's first 3D printing pen. That's as apt a description as any, since you can create rigid three-dimensional art ...

So far it's mostly been adults who've had the fun of using 3D pens, which is ironic given how drawing in mid-air can release your inner doodling child. However, the 3Doodler Start is a 3D pen from ...