That is a good prototype tool for proving a circuit. It is not the first time that I have seen a pantograph used in this way, however, but then again, I am old and have seen a lot. Very cool, good job!
I was toying with the idea of converting a printer with a flat bed into printing a circuit drawing directly onto the copper and then etching, allowing the ink to stay on while etching. Has anyone ever seen this done? The chemical would etch all the copper away except that which has ink, which would leave the traces and pads untouched. I have an old pen plotter that I was going to use for this experiment, but I have not gotten around to it yet.
What do you guys think? Would it work or not?