10:1 Herringbone Cycloid Gearbox

**better / improved version at http://www.thingiverse.com/thing:1597419 **
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I am the proud owner of two irreversibly crashed RC helicopters. The main drive gears were stripped (very cheap RC copters) but appeared to have a 10:1 ratio by measuring diameters. All the motors were fine. I started to wonder what one could do with them, maybe build a new RC vehicle given a better control board and frame.

Such questions led to this, a mini 10:1 cycloid gearbox using printed gears large