Recommend you turn off the sound. This video shows a NEJE 30W laser mounted on a Ortur Laser Master 2 cutting 6mm plywood. I'm using air assist from a compressor at 40PSI directed onto the cut using a 3D printer nozzle. 3 passes at 150mm/min gives a perfect clean cut. The Ortur was purchased with the cheapest 7W laser and using the supplied cables and the NEJE adapter board no soldering was needed to swap the laser over. The only mod needed is to extend the axis switch to stop the laser hitting the frame when homing. Skip to 6:00 to see the end of the cut and the finished result. Cut width is almost too small to measure with the laser properly focussed. I'm using Lightburn to control the laser.