[Thomas Sanladerer] shows how he makes PCBs with a CNC machine and has a lot of good ... He then switched out the engraving bit he was using for a proper end mill. That caused a bit of an edge ...

[Old Tony]’s hard-won CNC experience really fills in the gaps left by other tutorials. And it looks like a third part, dealing with making all this into something more than an automated Etch A ...