Personally I don’t but my grandpa was electronics engineer by trade and hobby and I was also talking to some electronics engineers in my previous job when I was toying with the idea myself. In both cases for home projects they were etching the paths by covering the plate with laser printer ink. When you get really good at that you can even get into SMD range of path width. The higher part of the range - you can’t outdo machine ECB printing if you want to get the paths really narrow - but workable.

1. print your paths on regular paper. The more DPI, the better
2. clean the empty board
3. use hot iron (like the one for clothes) to transfer laser printer ink from the paper to the board
4. take the paper off
5. inspect the paths, apply some marker (or wax, I think? I might misremember) in places where it’s not perfect
6. etch the board

Although, some of my colleagues at work were saying that at the prices you can order an ECB to be printed nowadays (for hobby better to find something local, so you have easier contact and shipping won’t cost you a leg) it’s not worth the hassle anymore. Pick the business which page looks like from the 90s. You are looking for electrical engineering veterans so they know more about electronics than webpages

You might want to search for your local hackerspace. For sure they have it all figured out for the area they operate in

I think, the point is, that this is the shit no-one has seen. It’s still hidden inside OP. Lurking