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Even after focusing your laser with the instructions that I linked below, the 3.8W may need a larger Pixel Resolution (step-over) setting than .006" so the burn lines do not overlap. The 3.8W laser beam’s divergence is larger then the 2.8W.
Experiment by adjusting the Gamma & Sharpen in the PEP5 image editor. I recommend starting out with a higher feedrate and use the Feed Rate Change (20%-25%) to enhance/expand the shades. Trial & Error!
