http://3dprintingindustry.com/2013/06/12/3d-systems-does-metal-finally/ (http://3dprintingindustry.com/2013/06/12/3d-systems-does-metal-finally/)
3D printing is fascinating and very handy for hobby construction as well, a friend gave me a half built Prusa Mendel which i would love to finish at some point, printing metals would be an amazing ability, but i have not seen a hobby build that does that yet, mainly plastics and wood compound extrusion.
http://reprap.org/wiki/Prusa_Mendel_%28iteration_2%29
http://www.3dprinterworld.com/article/using-your-2d-printer-for-electrical-circuits (http://www.3dprinterworld.com/article/using-your-2d-printer-for-electrical-circuits)
I wonder what kind of resistivity they can get with the silver nano particle ink compared to 1 ounce or 2 ounce copper foil? Any info on that floating around?