Duplo compatible train wheel rim

I was too lazy to search for a proper o ring for the drive wheels and I'm pretty sure my local hardware store doesn't have something like this.

Anyhow, here is a ring that can be printed with flexible filament as rubber ring replacement. Fits perfectly for me.

Practical test is still open but looks good on manual tests though.

Check out the original thing to build the train for yourself (or the ones you love): https://www.thingiverse.com/thing:2479704