Using a mask on plastic sheets when vector cutting them will yield a much better product. Remove the protective coating from the sheet of plastic. Do not use this as a masking material as it outgasses hazardous fumes if used in the laser. Apply a paper mask (see video below). Vector cut the sheet in the first pass. Remove the mask and raster engrave in a second pass.
Doing this will avoid getting flair up and smoke residue on the sheet that can't be cleaned off.
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