Researchers start 3D-printing in gold and copper   http://www.eedesignit.com/researchers-start-3d-printing-in-gold-and-copper/

3D Printing
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Researchers start 3D-printing in gold and copper #3DPrinting

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Paywall for the actual article, but the supplementary information gives some hints and shows what they accomplished a bit more. They were using an YB:YAG solid state pulsed laser and hitting a glass slide coated with a 200nm thick layer of metal. This is metal printing on a nanomachine scale. http://onlinelibrary.wiley.com/store/10.1002/adma.201501058/asset/supinfo/adma201501058-sup-0001-S1.pdf?v=1&s=598899bc2859a28764fdbad3a6a764b2e76d282f