4:1 2 speed planetary gearbox
thingiverse
Introducing a compact, two-speed planetary gearbox design! This innovative creation utilizes MOD 2 gears for a smaller size compared to previous models. The gear ratios are 4:1 and 1:1, switchable by adjusting the M6 bolt connected to the selector forks. While I have not personally built this, it should be buildable with possible tweaks for clearances. Constructed from 6mm MDF, it can also be printed with some adjustments. The parts list is available in a jpeg format, but note that there are three 12-tooth gears with 6.25mm bores and one with a 6mm bore (V2 of the parts list has been uploaded to reflect this). Exploded views are provided for assembly instructions. Good luck with your build!
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