I have been working on "scratch milling"[0] PCB's at home using my vinyl cutter/plotter and a engraving bit.
Inspired by Robin Debreuil his process and videos (see video the article and several forum posts). He is using a CNC but I figured regulating pressure is more important then depth, therefore my experiments with the plotter.
Currently dialing in the pressure/speed and amount of passes on a single layer copper board.
[0] https://hackaday.com/2020/07/10/making-pcbs-the-easy-way/