So, after diving into Wikipedia and my sister's old textbooks for a while, I'm curious to figure out if any monomer can be made into a polymer with the right photoreactive catalyst (and there seems to be a photoreactive equivalents to almost every normal polymerizing catalyst). If so, then it might be worth researching a way to make a UV-curing polyphenylene vinylene. Not only is it conductive (~7 S/cm, or .143 ohm/cm, which is pretty aweful for metal, but huge compared to current "conductive" filaments), but it's also electroluminescient. Meaning that a large portion of the resistance it provides is emitted as light rather than heat.

I'm at a loss as to how I'd take advantage of a conductive, glowing resin without the ability to print multiple materials, but having the option seems pretty awesome.

Polyaniline might be a good research direction as well, as it's apparently rather cheap to buy and conductive enough to be electroplated.