Pretty standard dimensions for 2.2 inch RC wheels. The 2wd fronts use 8mm x 3mm ball bearings. The rears and the 4wd fronts use the standard 12mm hex.
I suggest PETG for strength, but it might work fine with PLA, I just haven't tried that.
See my other rim designs: Directional Spokes: https://www.thingiverse.com/thing:4284220 6 Spoke: https://www.thingiverse.com/thing:4097652 Another 6 Spoke: https://www.thingiverse.com/thing:4284172 5 Spoke: https://www.thingiverse.com/thing:4284192 Dishes: https://www.thingiverse.com/thing:4097672