As stated, you can engrave polymer with lasers. However, it's pretty specific to the laser. We have two--- the big boy for metal will NOT engrave polymer properly, but the Fisher Price looking one does a fantastic job.
Just be aware if it's a high end laser engraver, it either may not be able to do polymer properly--- or take a whole bunch of setup. Best not to assume if someone engraves metal they can knock out polymer as well. They're two different beasts.
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