PCBs to be routed are designed different than you would for chemical processing. For one, if you want copper fill on a chemical processed board, you need to add copper fill in your PCB drawing so it will be included in the negative and the copper will not be dissolved away in the chemical process. On a CNC router, you don't need to include copper fill in your PCB drawing. All you want to do is rout out the traces. The copper fill (remaining copper) will remain on the board whether you have copper fill in the PCB drawing or not.
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