First test (printed and "working") of my hypocycloid gearbox generator (scad file at http://www.thingiverse.com/thing:481167). Pics will follow when I get my camera back! This version needs improvements to avoid jerky output motion. Perhaps changing parameters in scad file (peg diameter, etc). Still interesting test that proved it worked! Note - the linked-to scad file isn't exactly neat and tidy! Sorry!! (still learning)