JasonAs an alternate to the stepper motors, these cheap N20 geared motors also work very well. The drv8835 drivers also work fine with normal DC brushed motors, so there are no changes to the electronic hardware.
STL files for this are here:
Alternate motors - n20 geared motors
A project log for 'CNC' Stepper Motor powered LEGO Technic Tank
Using an ESP32 and 'CNC' Stepper motors to power a LEGO Technic track vehicle.
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