4:1 planetary helical gear box
thingiverse
helical gearbox for stepper motor, or for 3.5mm rog 12v motor (rs380) required : 3x m4 screw 3x m4 bolt 4x m3 screw 25mm 4x m3 bolt 3x spring careful on ( ring_36_teeth ) model is one side open it might merge when printing it out
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