CNC Machines Laser Upgrade InstructionsOpenBuilds LEAD/WorkBee CNC Laser Upgrade Setup Guide LEAD and WorkBee Laser Upgrade - Software Setup To cut or engrave, it is necessary to generate the appropriate G-code using the following commands: M4 Laser ON M5 Laser OFF SXXX PWM duty, where XXX is a number between 0 and 1000 (e.g.: 0 = 0% and 255 = 100%.