Mini Tank Arduino based
thingiverse
I designed several tanks from scratch, but consistently ran into problems with excessive friction in the treads due to small motors. Fortunately, I discovered these: https://www.thingiverse.com/thing:132199. I then built a tank model around them. It was very straightforward to assemble, requiring only a few M3 screws and two longer ones for the wheels. Currently, it's configured as an autonomous tank, but could just as easily be controlled via Bluetooth. Plenty of Arduino circuits and code for this can be readily found online.
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