When drilling, SheetCam has options for min hole size and max hole size. Only circles between those two values will be drilled. This allows you to have several different sized holes on the same layer and only drill the ones you want.
The demo versionis limited to about 150 lines of code. If you go to the registration page on the SheetCam site you can ask for a free 30 day licence. This will remove the 150 line limit.
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