Drive wheel axle Robomow ms 1000

My Robomow MS100 broke a wheel axle so I deigned a replacement. It works like a charm after some fine tuning with 8 mm and 3.5 mm drill in the holes.
Edit: It broke after a few days because twisting forces broke the layers in my print. I then printed v3 standing up and it has held for about 2 weeks now.

Printed lying down for strength. Print with supports.

Robomow v2 is designed for printing standing up. no suports needed. it has an extra ring for strength witch is additional and not yet