http://www.epson.co.jp/e/newsroom/news_2004_11_01.htmThis 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!