Compound Planetary Gears 1300:1

UPDATE: This is old news and has been done before. It is the basis for gearboxes such as [High Torque 149.33:1 Compound Planetary Gear set](https://www.thingiverse.com/thing:2550882). Check out [Solid Core Compound Planetary Gearbox](https://www.thingiverse.com/thing:3511382) for something new* - a single piece sun gear version with similar high ratios.

This is a print-in-place compound planetary gearbox. There are two planetary stages stacked vertically. The old trick of having one tooth few