Green and white rowmark

i’m having issues with engraving green top sheet and white under sheet of rowmark i cant seem to keep the dust from getting in the white letters i’ve tried a bunch of stuff with no progress please help

Are you running air assist ? if you are it is either not aimed correctly or not strong enough.

i have a boss ls2440 air assist is off/ as low as i can go with out getting a flame

Actually I have just seen someone mention they get best results with Air totally off as it was blowing dust back into cuts

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