I did watch the video thanks. But wasn’t entirely sure if they were referring to DPI of the artwork or DPI of the laser engraver. The laser engraver has for all my test been set to the manufacturers specifications of 254.
I have tried printing the artwork to PNG from 300 to 3600 DPI . I have tried speed adjustment from 600 to 1800mm/m this has little to know effect on the issue I am encountering. The only thing that has made any difference it set the lightburn software to PassThrough which appears to fix the problem apart from line thickness variations that probably caused by the aspect ratio of the laser. Using pass through also slight changes the scale but I assume in pass through mode the scaling factor in light burn is ignored and maybe the image is the original artwork dimension. I have been print everything so far at 7% scale as it prints the image much too large. When I print the artwork PDF or PNG file to A3 paper dimensions are correct but when I import into lightburn I have to resize it to be dimensional correct. Not sure if resizing the image of significance
If I draw an image in lightburn I could try engraving that and see if it works better then when I try and import an image