I know a lot of different ideas have come about for eventually being able to print circuits with the RepRap but I wasn't sure if anyone had put forth this idea yet.
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www.sparkfun.com]
This is a conductive thread. Obviously not as good as wire, but it looks like this kind of thing might be easier to lay down (perhaps covered in a molten plastic -- not sure of the thermal properties).
Just an idea and wanted to see what others might think.