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It is not 3d printing but it is a sort of DIY additive manufacturing. Arduino Pro Mini board was made by using a pen plotter and the Electroninks Circuit Scribe roller-ball pen with highly conductive ink to draw a circuit on a sheet of paper. Electronic components are then mounted on it with glue or sticky tape. And it works!



This method for conductive ink printed circuits could be easily adapted for 3d printers. There are also several methods to produce DIY conductive ink with various material mixtures.
Also you shoudl keep in mind that this is made from paper, so if you put too much voltage in, it could catch fire. Stay safe.

Detailed instructions and all the files can be found here:

http://www.instructables.com/id/Paperduino-20-with-Circuit-Scribe/?ALLSTEPS

























Conductive ink on paper sheet electronic circuit production is technology that is finding more and more practical applications, you can see interesting sensor here:

http://diy3dprinting.blogspot.com/2013/10/off-topic-sensprout-2d-printed.html

Here is one of the many methods to produce homemade conductive ink. This one is easy and cheap, maybe not the most suitable for this type of project. It is made from copper particles suspended in gum arabic water solution.

Printing technologies are expanding further. SenSprout is a device for monitoring air and soil moisture in order to optimize agricultural production and irrigation management. It is produced by printing the electronic circuits on paper with silver nanoparticles. It is powered by ambient radio frequencies (it harvests 2,4 GHz frequencies) and transmits data on same frequency.
I wonder how practical it would be for real life application since it looks fragile, it is currently deployed and tested. Even if not practical, concept is excellent technology demonstrator: downloadable printable sensors powered with surround electromagnetic radiation. Cool!
They use commercially available inkjet printers and commercially available conductive ink from Mitsubishi.
Project by: Yoshihiro Kawahara

SenSprout printed moisture sensor deployed (source:Wired)

I think this is Mitsubishi silver nanoparticle ink they mentioned: http://www.mitsubishiimaging.com/digital-imaging-diamond-jet-NANOINK.html







Applications of 2d printed electronic circuits are infinite, similar to 3d printing. Hopefully this technology will soon expand into DIY space. There are many corporate and academic developments in conductive inks, but conductive ink can be also produced in DIY / home lab setting (this one doesn't work on paper):




Ink video by NurdRage