Stackable Planetary Gear Mechanism (Reducer)

A fully functional hand-cranked model of a multi-stage planetary reducer. Each stage has a gear ratio of 1:6, so the overall gear ratio of a 3-stage reducer is 1:216.  The design allows for an unlimited number of stages, but a practical limit is 3 stages. Assembly takes about 30 minutes. Some of the cogs needs to be shaved so it can rotate freely. Mind the direction of the gears to assemble it correctly.