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In the last few years, additive manufacturing, also known as 3-D printing, has transformed from an interesting hobby to an industry producing a wide range of products. It is on the path to causing major disruptions in global trade \u2014 and changing the international security environment. The explosion of additive manufacturing means it is virtually impossible to provide an up-to-date list of materials that can be printed, but a recent top ten list <\/a>includes: metals, such as stainless, bronze, steel, gold, nickel steel, aluminum, and titanium; carbon fiber and nano-tubes; stem cells; ceramics; and food. Researchers are exploring the application of 3-D printing to fields from agriculture and biology to design and manufacturing. MIT developed a $7,000 multi-material printer<\/a> than can print ten materials in the same object during a single fabrication process. As businesses learn to use these multi-material printers, the range of products they will be able to print will expand exponentially.<\/p>\n Through it all, the products produced by additive manufacturing will increase in both quality and complexity. In February 2015, Australian researchers printed a jet engine<\/a>. But don\u2019t think metal printing is only for major corporations \u2014 Michigan Tech designed a 3-D metal printer for that can be built for $1200.<\/a> Creative people worldwide will be able to develop and produce metal products.<\/p>\n Nor does size seem to be a limit for additive manufacturing. It can produce products from nano-scale to tens of meters. IBM developed a 3-D printer capable of printing microchips<\/a> with nanometer resolution at a fraction of the cost of current manufacturing systems. At the other end of the size spectrum, large printers<\/a> are producing cars<\/a>, houses, and even five-story buildings. Further, 3-D printing is efficient because material wastage is near zero. It may be cheaper to make a part from titanium using additive manufacturing than from steel using traditional machining.<\/p>\n