This is a wheel that I designed. It is 72mm (3in) in diameter and fits onto a 5mm shaft. Feel free to change the design however you want for personal use.
I printed the hub out of ABS on an Ultimaker S5 and the tire part on a Formlabs Form 3+ from 80A flexible resin.
The design of the tire allows the wheel to flex easily and deform to increase the surface area for more grip. The design of the hub makes the wheel lighter and consumes less filament. The hub has a two holes for an M3 bolt to provide the option to tighten it onto the shaft. There are two of these holes, because one would make the wheel unbalanced.
I hope that my wheel design will help someone's project or at least inspire a new project.