Only ThinkGeek would come up with something like this: a 3D printer that prints in Play-Doh that's controlled via an iPad and manually powered through cranks. It's also ridiculously cheap.
First, some quick assembly (of the snap-together variety) and your Play-Doh 3D Printer is almost ready for action. Add 2 C batteries, plug it into your iPad, and launch the free app: iPlay-Doh 3D. Quickly design all sorts of things on the free app and then send them to your Play-Doh 3D Printer. Add up to 3 different colors (they'll blend like soft serve ice cream) to the top of the Play-Doh 3D Printer and then watch your iPad for directions. The iPlay-Doh 3D app will let you know when the printer is ready for you to start cranking.
There are two different cranks on the Play-Doh 3D Printer: one to drip the Play-Doh down onto the conveyor belt and one to move the conveyor belt back and forth (to make sure the Play-Doh gets in just the right place). Sure, the overall product isn't as sturdy as an expensive 3D printed object, but it will air-harden and can be painted just like one. With the Play-Doh 3D Printer, you'll learn basic CAD skills, bow hunting skills (just kidding), and 3D printing skills
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