M3 S255and check if the laser is on.
M3 S255via Terminal, and see if the fan in front of 3D module is running or not.
M3 S255, then pls re-try laser engraving by following our user manual.
M3 S255, and after switching to 3D printing module, the fan in front of 3D module works under this command, then the laser module is defective. please email [email protected] with the relevant image/videos and we will help you to make it right.