Lego Wheel Axle for Motor/Gearbox

by blatantsubtlety, published

Lego Wheel Axle for Motor/Gearbox by blatantsubtlety Nov 22, 2012

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Axle/Hub for Lego wheels

Connects Round, D, or Hex motor shaft to Lego splined axle wheels, or gears.

Fully parameterised to customise for different wheels and shafts.

Originally to connect M3 motor shaft on Tajima motor/gearbox kit to Lego splined axle wheels.


Printed at 0.2mm layers on UP!.
Setup to build 45degree overhangs with no support. Trim dimensions for exact fit.

Motor shaft hole can be Round, D, or Hexagonal.

Uses metal hex threaded standoff for M3 connection
standoff is M3x10mm x5mm across flats JAYCAR HP0900
standoff is press fit into hex hole. Hole has domed ceiling so prints without support.

Lego axle design has keyholing to get cleaner inner corners than a simple cross, on the UP

Has provision for two Flanges that can directly engage the inner surfaces of the wheel rim to provide support
as the printed axle is prone to shearing under load.
It is intended that the flange/s are interference fit into the hub parts,
and that the wheel is forced all the way down the axle to the flange so the axle is not cantilevered
Intended for insertion from the deep side of the wheel hub

Dimensions for two types of wheel in here, see photo. Note the larger type is suitable for both types of wheel.

To remove, it is recommended to press the spline out to start, rather than try to pull it out.

23/11/12: Update for round or D or hex motor shaft hole; colorise parts;

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