I'm currently using a 60W laser to cut 1/4" acrylic for board game components. I've noticed that the cut is always angled due to the focusing cone of the laser, so my fix so far has been to focus down below the surface of the material a bit to compensate for the cone. It's still not wonderful, however, and the edges are always a bit angled. With pieces that stand up on those cut edges, it means I can't make anything very tall since it's bound to fall over.
I tried a search, but I'm not really sure what key words to use and couldn't find anything useful.
What do you folks do to get straighter acrylic cuts? I'm currently using 20% speed, 100% power, 5,000 frequency with a single pass.