354:1 planetary compound gearbox
thingiverse
https://youtu.be/3EOHyrEP4kE This is a high gear ratio planetary gearbox design. It can work with NEMA 17 stepper. Please note, there are 3 different planetary gears. Points on them are used for alignment:  Source files and math explanation: https://github.com/kwahoo2/Mortargear
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