I saw this on kickstarter and thought it is an amazing tool for doing really quick special piece prototypes. There's a ton of ways I could see this speeding up my process, and making higher quality pieces at the same time. The kickstarter still has a long time to go and is already funded.
It's basically a 3d printer in a pen. Watch the video for a better description.
http://www.kickstarter.com/projects/1351910088/3doodler-the-worlds-first...