Not OP, but I've had luck making PCBs on my Taig mill. Might want to choose something with ballscrews or at least preloaded nuts or potentially a belt drive. PC

Not OP, but I've had luck making PCBs on my Taig mill. Might want to choose something with ballscrews or at least preloaded nuts or potentially a belt drive. PCBs hate backlash, but don't constitute a high load.