Jazz is correct on increasing DOC. Also as Jazz posted you really want to work with Cast not extruded. Cutting a lot of acrylic for sign folks and the best I can suggest has for the most part been stated. The only thing I can add is that you want to stay with either two flute or single flute for the best finish. Also doing a finishing pass in the opposite direction will aid greatly in the quality of finish you get (this does include areas where you have not cut all the way through). The only exception to the second pass I have found is when cutting with a V carve bit, than it is one pass and the job is done. -Michael