Not a router but a high speed spindle, runs at 24,000 rpm. In fact I am right now preparing a new post about this subject.
Here are a couple of pix.
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In the past I have made PCBs by etching, by drilling holes from a simple drill jig and using the holes as references to draw tracks by hand with a "resist" pen, before etching.
That is messy and now that I have a CNC mill I prefer making tracks with isolation milling. This will be clear in the upcoming post.

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