If you keep up with various retro vacuum tube projects, you probably have run across [UsagiElectric] aka [David]’s various PCBs that he makes on his own Bridgeport EZ-Track 3-axis milling ...

The result is an impressive PCB milling machine that can do double-sided PCBs and make through holes. The excellent write-up that [Gosse] did on this hack describes how he converted the printer ...