There are a few things you should avoid cutting with a laser. Here is a list of materials that can be damaged by laser cutting:
-ABS plastic: This material can melt and release harmful chemicals when cut with a laser.
-PVC: This material can also melt and release harmful chemicals when cut with a laser.
-Rubber: Rubber can be burned by the laser, so it's best to avoid cutting it.
-Paper: Paper can catch fire easily, so it's best to avoid cutting it with a laser.