However you cut it, it looks awful unless you polish the cut edges. This is best done on a cloth wheel made up of many layers of fabric. You can get one mounted on a spindel and use in an electric drill or just buy one for a bench grinder. Buy a stick of jewlers rouge and hold it againist the running cloth wheel to apply it, then hold your plastic against the wheel to polish. You can make the edges polished and rounded in a few seconds and it looks professional rather than as if a rodent was used to knaw it to size.