@foone 15-20 years ago, UV photoresist was the “fancy” way of doing it in my uni in Brazil.
Usual one was, photocopy the design in the darkest setting to get as much toner as possible stuck to the page (thin paper worked best), then use a clothes iron to heat transfer it into a bare copper board.
Dissolve the paper in water, then throw the board into an FeCl3 solution to eat away the bare copper and leave the covered traces behind. Then scrub with IPA to clean it, and drill.