400:1 (3600:1) external gear planetary gearbox

I wanted to create a high ratio planetary gearbox that uses external gears only, for 2 reasons:

• easier teeth clearance tuning,
• in the future should be possible to replace 3d printed gears with on-shelf metal gears.

The gearbox uses external gears, 1 and 1.25 teeth module.

The planetary ratio is 400:1, total ratio 3600:1.

Non printed parts:

• 6 bearings 625
• 1 bearing 5201

M3 screws and nuts (8+8),
M5x25 bolts (3)
M5x65 bolts (3)
M5 nuts (6)

For testing purposes I used GM3408H BLDC motor and an original driver package.
There is optional output for LPD3806 encoder.

Satellite gears placement is important. Please check the STEP file to learn more.

Note: process of support removal from planetary carrier (input_bracket.stl) is not fun at all and needs some patience.