Henry
Aug 15,2023The text looks similarly brown and reasonably well focused, so the laser diode is probably producing about the same amount of power. Different material, even from the same box, will behave differently. Plywood, in particular, can have vastly different wood / glue / junk inside. The speed may simply be too high for reliable cutting, with the first sample coming out fine because everything else canceled out. Run a similar test between speeds of 5 mm/min and 100 mm/min with power from 10% to 100% to see if that’s the case.