Fwiw, when I was making circuit boards I used a laser jet. Not much luck with inkjets as many I tried used a dye ink and they passed light and messed up the photoboards exposure and contrast needed. The laser jet had a much darker toner, thicker, and I could print it on clear film, or burn a contact sheet on orthographic high contrast film. Then put a photo clad circuit board under a sunlight, developed it, and did the etch with the ferricyanide.
I could do double-sided boards down to the tiny surface-mount IC circuits and components that way. Used a small drill to align the film images on the boards. I believe I used Kepro boards back then (Now bought out by camconchemical.com).
I could do double-sided boards down to the tiny surface-mount IC circuits and components that way. Used a small drill to align the film images on the boards. I believe I used Kepro boards back then (Now bought out by camconchemical.com).