Split Ring Planetary Gear

Best explained by watching it work. See video at:

https://www.thingiverse.com/thing:2117108

And if you still don't understand how it works, see

• https://www.thingiverse.com/thing:1362555 -
• https://www.ideapropulsionsystems.com/idea-propulsion-systems/2017/3/17/geeking-with-gears