Here's a link to a conductive epoxy that is one part and can be diluted with acetone. It is heat cured. So, theoretically one could "print" the circuit, stick the components on and cook it to cure the epoxy. It appears that it would work, but there would be considerable development time involved in designing the proper "applicator". Something like a solder paste applicator might do. I asked for more information, but master Bond is not really hobbyist friendly. Any thoughts or comments? Mark <http://www.masterbond.com/tds/supreme-10hts?utm_source=valentines&utm_medium=email&utm_content=pd-sup10hts&utm_campaign=vrsm>
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[Homebrew_PCBs] conductive epoxy
2013-02-18 by Mark Lerman