Wltoys 12428 differential spacer

thingiverse

I had trouble with my Wltoys 12428, and the front differential was far too tight - almost to the point of being unusable. This led to serious understeering issues. To get it working smoothly, I added a spacer. In my case, 0.3mm worked perfectly, but you can also download spacers with variable thickness: 0.15/0.20/0.30/0.45/0.60. Use the thinnest possible spacer to avoid the risk of teeth slipping if you choose one that's too thick.