A new Kickstarter campaign  from WobbleWorks has taken the core idea of modern 3-D printing tech  and applied it to an old-world tool: The pen. The 3Doodler device is essentially the plastic printing head from a 3-D printer in a handheld form, and thus allows much more free-form "printing." Because it spreads quick-setting ABS or PLA plastic, the pen can be used to draw or trace an object, and even stack up layers much as a proper 3-D printer could into a more tangible object.
Arguably the 3Doodler is more of a toy  than a practical tool like a 3-D printer , but it is a clear demonstration of how far the idea of 3-D printing has reached so very swiftly. The project's funding goal is just $30,000, and $50 gets you one to play with with your kids.