so they milled you a PCB mill out of PCB. They announced their surprising new open source hardware product, a pocket sized 3-axis CNC machine entirely made out of FR4 PCB material, aptly named ...

Figure 2-6: Simulation of a dual rotary mechanism fastened to the table of a standard 3-axis CNC milling machine. Tool length offsets work the same way here as with any conventional 3-axis machine.

you probably have run across [UsagiElectric] aka [David]’s various PCBs that he makes on his own Bridgeport EZ-Track 3-axis milling machine — massively oversized for the job, as he puts it.