Direct-to-PCB laser printing
“Also, contrary to popular belief, there’s no issue with laser printing on a conductive surface.” – from here.
I’ve seen this in operation at Worcester Polytechnic Institute. There, the flexible/soft robotics lab uses copper tape on plastic substrate to make PCBs, sticks them to a sheet of paper, and runs it through a totally-normal, unhacked laser printer. Copper tape is probably thinner than PCB copper, so it ends up not sinking too much heat away from the fuser. The resulting PCBs can be etched right out of the printer, with no ironing step in the middle.
I have to hit a hardware store at some point this week, perhaps I’ll be able to get copper tape there.