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Hacking a Makerbot mightyboard Rev H to engrave PCB's - 11 years ago

I have a mightyboard Rev H motherboard that was a spare part purchased for my school's Makerbot Replicator 2. I teach electronics/robotics and my students use Ferric Chloride to etch hand drawn PCB's. A messy and somewhat dangerous chemical. I want to make a CNC mill (so to speak) using this motherboard to cut the traces with a small endmill. Is there anyone out there with suggestions or ideas f