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Instructables user rmd6502 made a detailed tutorial how to design a 3d printed soldering mask for your electronics projects. he goes from Eagle EPS to PDF format, then PDF to DXF and then uses OpenSCAD to get the final STL.

He writes:

This is a neat way to save a bit of money when you order boards. Normally you pay an extra $25-50 for a solder stencil, either a silkscreen or a sheet of metal with holes where the solder paste needs to go

Detailed guide can be found at:

http://www.instructables.com/id/How-to-3D-print-a-solder-mask/?ALLSTEPS

Mikey77 made a small 3d printable electronic circuit and created a detailed how-to guide on Instructables. It is made on a regular FFF DIY 3d printer (Replicator 2) shaped like network of grooves and holes in a printed board filled with DIY conductive glue which closes the electric circuit.

Video of a working printed circuit:




Detailed building instructions, .stl circuit files and more photos:

http://www.instructables.com/id/3D-Printing-3D-Print-A-Solderless-Circuit-Board/?ALLSTEPS

DIY conductive glue which closes the electric circuit:

http://www.instructables.com/id/Make-Conductive-Glue-and-Glue-a-Circuit/?ALLSTEPS

User Bam from Lulzbot forums experiments with 3d printing metal solder. He had some success but there are obstacles in the road. This could be interesting for electric circuits 3d printing.


He notes:

Early experiments with metal printing with a Budaschnozzle 1.1 are looking good. Repeat: early experiments (Tin 95.8%, Copper 4%, Silver 0.2%, McMaster 76805a61). If you can wait a few days before trying this out, I'll let you know if it destroys the nozzle. Fun fact: silver solder will stick to painters tape.
The flow cuts out after about 15mm of 3mm feed, we might be able to extrude continuously with a larger thermal mass around the nozzle (metalschnozzle?). Alternately we could print in short bursts through some sort of g-code trickery.

His plans for the future:

• Faster extrusion at higher nozzle temps (going to give an all metal noz a shot)
• Printing through a glass nozzle (I've got some lab grade glass eyedroppers on order that I'll try to hack into a hotend
• Smaller diameter filament (should cut down on the heat soaking up through the filament)

http://forum.lulzbot.com/viewtopic.php?f=29&t=380&p=1992&hilit=bam#p1992