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@Andrew: Those CO2 lasers are powerful! If you or NoName007 get a chance, please try a voltage divider circuit. Sounds like you’re both engraving at a max power level of 25 which is roughly 10% of the 255 PWM limit. This equates to roughly .5 volts out of a 5V range. If you take a 9K and 1K resistor and create a voltage divider (other values will work-Google voltage divider calculator), you’ll bring down the 5v PWM output from the Arduino to a .5v output while still retaining the full 8bit(255 step) resolution. It may not work but it’s worth a try and will only cost about a dollar in parts and 5 minutes to solder. I’m VERY curious to see if this will improve your grayscale results.