I found some new (to me) acrylic on Amazon the other day and long story short decided to test it out with a couple of patent application engravings.
The pieces are 5 x 7. The engraving worked great with standard settings, I had to make a second pass on the cut but other than that everything worked as expected on these test pieces.
The material link is here:
No affiliation on the link, just thought I’d share. You can hardly go wrong for the price.