I’ve honestly been wanting to learn more about it for a while. My dad is a major electronics hobbyist, and I’ve watched him make circuit boards for personal projects since I was a kid. I’ve always thought it was cool, but until more recently with keebs, it hasn’t directly overlapped with any of my own interests.
He uses an acid etching process to make his boards, starting with copper-coated FR-4. He used to start with a laser-printed heat-transfer sheet, but these days he uses plotter-cut vinyl as the etching mask. I’ve thought for years it would be so cool to do a handmade circuit board for a keeb as a collaborative project.