Duplo compatible train wheel rim

thingiverse

I was too laid back to hunt down a proper O-ring for the drive wheels and I'm pretty sure my neighborhood hardware store doesn't carry something like this. Anyhow, here's a ring that can be printed with flexible filament as a rubber ring replacement. Fits perfectly for me so far. Practical test is still pending but looks great on manual tests though. Check out the original design to build the train for yourself (or the ones you love): https://www.thingiverse.com/thing:2479704