Black uneven spots When Engraving Acrylic

My GF started having trouble cutting through acrylic, and is now producing big black lines when engraving acrylic that do not wash out. Can anyone give me insight? I have already cleaned it, but will go through again…

To me, those look like liquid flow lines, not laser artifacts. Could be more of a material problem than a Glowforge issue. What happens when you try to engrave something else?


Just curious…is that cast or extruded acryic?


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