LaserProjector V2 is a battery-powered, ESP32-based laser XY scanner using stepper motors to deflect the beam. It has auto-homing functionality, and can be controlled wirelessly (Wi-Fi & Bluetooth).
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I was wondering if you had any remaining sources you knew of for the stepper you used? I couldn't find it on aliexpress, I even went to the same seller as the page in your video.
Have you tried the more common 28BYJ-48 motors? My guess is the reduction in those is a little too high / motor is too slow to draw lines?