WLToys 144001 big tires (maybe 124019/18 and 104001?)

For use on grass and gravel. Might not work so well on asphalt. The bigger diameter (~90mm) is useful in taller grass. If you prefer the underside of the printed part to be on the outside/inside (maybe because you use a textured printbed), feel free to mirror the TPU.stl. I tested the first print and it worked right from the printbed. The hexagonal hole is a tight fit depending on your printer tuning.

Front wheel is slimmer (25mm) vs the wheels on the back (30mm). Just for the looking :D

I used the following settings:

PLA (or PETG): 3 perimeter, 15% infill, 4 top and bottom layers, temp as needed, support!

TPU: 2 perimeter, 0% infill, 5 top and 4 bottom layers, temp as needed, NO support ;)

The two parts fit together tight. However, it might be best to glue them together.