No problem, I thought so.
But the link got some clicks, so it is in the right place.
I do cutting and engraving tests on every new material (but have no 20/40w laser yet).
Cutting:
Engraving:
There are a few other “snapmaker laser test” available on thingiverse, check it out 
.
Attention about the power level, maybe adjust it and post a remix.