mini robot platform

this is a robot platform I have been working on , with 2 frames for different applications.
One has 4 wheels ( skid steer 4 motors) and the other has 3 wheels (servo steer 2 motors).
motors are the little yellow plastic ones that come with wheels sometimes ( the wheels in the kit should work )
https://www.amazon.ca/Gearbox-Motor-200RPM-Tire-Wheel-Arduino/dp/B07VBXXT9M/ref=sr_1_9?dchild=1&keywords=gearbox+motor&qid=1627353796&sr=8-9

The wheels I printed from tpu with the hubs from petg, and pushed in with a vise ( there in there pretty tight)
the frame and top are printed from petg but I'm sure pla would do just fine.
the steering shaft and rear axle on the 3 wheeled frame are 4mm and one support has bearings (8mmx4mmx3mm) and there is a bushed one as well .