Problems with iris acrylic

I,
I’ve having trouble cutting and engraving2,6mm blue iris acrylic.
The design isn’t clean and the polastic seems to melt on the opposit side.
Does anyone have a solution
Thank you

This will never really work. You are using a blue diode laser; it can’t handle blue materials. You can only use it for dark, opaque acrylic in general. Try black, red, green, but no blue.
Results will be a bit unpredictable, as you noticed.

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Ok thanks .