Glass circle cutters are the most accurate tool for circle cutting of fused glass. Glass circle cutters make the job easy and minimize the need to carry out any additional finishing work.
Cutting tools come from a number of makers’ in a variety of styles and sizes. Prices can vary quite widely.
Some of these cutters have a suction cup that allows the cutter to be attached to the glass. This type of set up allows the cutter, which is adjustable, to rotate around the cup.
You should look for a cutter that will enable the glass to be scored in one motion.