Cracked/chipped edge

Hi,
I have China co2 laser. When cutting 3mm acrylic, the edge appears to chipped. It was cutting fine last time, after 2 weeks of not using my laser machine, this happens.

When I was exploring “cutting and engraving acrylic” I found a video on YouTube that talked exactly about that. As my machine is not CO2 I didn’t keep it, but I know that this information exists somewhere.

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