Cheap Laserengraver using 28BYJ-48

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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WARNING !!!!!!!!!!!!!!!!!!!!!!!!!!!!! Laser is extremely hazardous. Never use it without proper safety protection. A cheap 250mW Laser can cause severe eye damage. You must take precautions to protect your eyes. If you don't have any safety goggles, you can use a phone's camera as an alternative, but be aware that this could also damage the camera chip. I am not responsible for any damage caused by using this laser engraver. Notice: Before printing, try assembling one of the smaller parts to check if the inner diameters will fit your printer. I designed them 0.5mm larger so they should fit my Geeetech A30. Here are the required parts: 1x 250mW Laser, tested in my video (with mounting for more powerful lasers coming soon) https://s.click.aliexpress.com/e/_dVdFYFk OR 1x 1000mW Laser (not tested, unknown reliability) https://s.click.aliexpress.com/e/_d8SLVCm 2x Timing Belt G2.5T (1m is sufficient) https://s.click.aliexpress.com/e/_dYMpcQ6 4x Bearings 625Z https://s.click.aliexpress.com/e/_dVgLcWK 2x 28BYJ-48 12V Stepper Motors (modified as described) https://s.click.aliexpress.com/e/_dWisYue 3x Screws M3x10 https://s.click.aliexpress.com/e/_dYCCKny 4x Smoothed Rods (use any length, two pairs per axis) https://s.click.aliexpress.com/e/_dZU3jhc 6x LM8UU Bearings https://s.click.aliexpress.com/e/_Bf6YHSse 1x M8 Rod (length depends on the rods used, two for the Y-axis) https://s.click.aliexpress.com/e/_dT2z4Jy 1x M6 Rod (length depends on the rods used, one for the X-axis) https://s.click.aliexpress.com/e/_dT2z4Jy 4x Bolts M6 https://s.click.aliexpress.com/e/_d6H6OLc 8x Bolts M8 https://s.click.aliexpress.com/e/_d6H6OLc GRBL Controller (Uno Shield, old 3D printer hardware... or any other compatible controller) https://github.com/grbl/grbl https://s.click.aliexpress.com/e/_dTgSJxg To modify the stepper motors from unipolar to bipolar, remove the red wire and scratch the trace on the PCB between the two contacts. This will allow you to use them with normal stepper drivers. Set the current of the stepper drivers to around 0.09V or 0.08V for smooth operation without overheating. Don't tighten the belts too much, as this can damage the cheap gearbox inside (I lost five motors due to over-tightening). The X-axis can be tightened by the M6 rod in the middle. For engraving software, I use LaserGRBL on a virtual machine: http://lasergrbl.com/ Video of the working laser at original speed: https://youtu.be/H9AmGd_vd2k