This looks cool and could be a much easier solution than the aforementioned laser/printing setup. Judging from the website though it doesn’t look like they have a product ready to go, is that true, and are there any alternatives? It would be nice if there was a filament I could just plug into my 3D printer and start using :p

I think googling "conductive" plus one of "3d filaments" or "t-shirt ink" or "epoxy" or "resin" or "nail polish" or "paint" is a good place to start.

I believe that company will probably sell the ink by the barrel full for industrial fabricators.