Quote Originally Posted by Feign View Post
One possibility for printing circuitry is to have the conductive filament traces printed in a hollow channel with openings on the outside of the print and a sprue tree connecting all the exposed ends of the conductive filament. After it's done, do an electroplating process on the whole thing (figuring out a way to deal with bubbles) until the channels are filled with the electroplating metal. Cut the sprues off the part and you have a solid metal trace circuit integrated into the print!

Of course, that's assuming that the conductive filament is conductive enough to take plating a good distance from the point of contact.
If you scroll up and read the rest of the thread, you will find you don't actually need to assume.