A wheel compatible with the shaft on Micro Metal Gearmotors from Pololu. The tire pushes onto the hub it's a snug fit that should prevent it from falling off. The fit on the shaft is made to be tight too.
Literally my first design.
Designed in Fusion 360, printed on a Prusa Mini.
0.2mm Layer height.
Hub printed in PLA
Tire in TPU with no retractions. If you do want to print multiple at the same time I'd recommend doing it sequentially.
The author hasn't provided the model origin yet.