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Wonderful design!
I had doubts it would print without support, but it did, perfectly, with very few minor problems (PLA, sliced with Simplify3D, printed with Arduino MAteria 101).
Definitely the coolest thing I've printed so far.

Mechanics work great right after assembling, if a bit of CRC is sprayed in the moving areas it becomes incredibly smooth.

Great job, thanks for posting it!