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Just finished building my compact planetary gearbox! I designed it from scratch in CAD for small, high-torque BLDC motors. It stands at just 4.5cm tall with standard bearings and features an 8:1 gear ratio. The spur gears are machined from 4041 alloy steel by PCBway
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Bearings are great. With just two, my tiny 8:1 planetary gearbox becomes easily back-drivable.