Bosch Rotak 43Li Lawnmower wheel centre bush

The rear wheels on my Rotak went wobbly. When I took them off it turned out the centre of the wheel had either never been there or had worn away. It's a slightly complex shape as it has a taper and 8 splines. I printed this in nylon as that has such low friction and is tough. Depending on the wear and tear on the wheel and the accuracy of your printer you may need to change things a bit so I've included the FreeCAD source too.