http://www.epson.co.jp/e/newsroom/news_2004_11_01.htm This prints conductors and insulating layers in subsequent passes. Time will tell if this is viable and also can trickle down into a hobbyists's realm. The specs are neat. 50 micron line width, 110 micron line pitch, at 25.4 microns per mil, that is 2 mil width on 4.4 mil pitch. Do that with your Staples paper!
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Did you see the epson press release? Inkjet PCB!
2004-11-02 by thespeakerguy