World Maker Faire New York 2013
RepRap Simpson and RepRap Wally are two very cool and experimental 3D printers. They are very cheap to make, open source, and use no linear rails. Once you see them move, you will be mesmerized.
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About the Maker
I am a nerd and a computer science teacher. You say redundant. I say a lot of a good thing. I love to build things and if those things have neat mechanisms, awesome!