Um? Your laser?
If you need a coin of an exact size, figure out the kerf for that material and compensate for it in your design and it’ll be exact.
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If you are a premium subscriber, there is a shape tool, and you can set the exact size and location using the Ruler tools in the bottom left of the UI. If not, you can make a circle in any graphics program (Adobe Illustrator or Inkscape are the 2 most common) and when you open that in the UI, you can again make it any size you want using the Ruler tools, bottom left of the screen.
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