3d printed mechanical computer. Looks cool and it is powered by hand. No practical application :-)
http://www.thingiverse.com/thing:101105
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From video description:
http://www.thingiverse.com/thing:101105
From video description:
This is a (nearly entirely) 3D-printed, entirely mechanical computer. The machine has three single-digit, base-10 registers for memory, and is running a 4-instruction program that computes the fibonacci sequence. In the video, it starts out with the registers reading '1, 1, 0', and computes the fibonacci sequence up to '8' before overflowing. For higher resolution photos and a write-up, see: http://www.chrisfenton.com/the-turbo-entabulator/