Hello, i try my new laser Sculpfun S30 with your latest version 1.2.04 (demo on Os Win10 X64) use a usb cable 2.0 in boundle, add a Laser and enable M8 but NOT cut and engrave anything, even tried (80% and 100% off Power laser) with an a4 sheet of paper it cannot cut it.
Laser S30 is ok, i try other software (laserGrbl) same file, 30% of power and work fine, cuts and engraves without problems .
As PY suggested, you didn’t setup the laser correctly. Here is some additional guide on how to configure the S30 with LightBurn: Setting up the software - Diode Laser Wiki