OpenRC 540 motor mod modified rear axle
thingiverse
This is a rear axle from the OpenRC Tractor 540 motor mod, featuring a reduced shaft diameter to allow servo wires to pass through the chassis without fraying the insulation. The thinned-out axle remains strong. My 4-year-old son has been playing with the tractor for some time, and despite breaking two rear wheel hubs, the axle has shown no signs of weakness. Two 18x12x4mm ball bearings are required for proper rear axle operation. Refer to the OpenRC Tractor's bill of materials for suggested supplier links.
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