For this piece, I used two different types of materials.  I used 3mm thick Red opaque acrylic from Glowforge and green acrylic sheet from xTool.  I am making it for a friend that I'll be visiting soon.  When cutting the thicker acrylic make sure that you always engrave first (Blue light, 30% power, 50 speed, 1 pass, 200 lines per cm, bi-directional) and then cut after (100% power, 3 speed, 2 passes).  I can't quite remember what I used for the thinner green sheet, but the settings were fairly fast, likely close to 1000 speed.  Good luck!