[uncommonsense]

These 3D print outsourcers can print with metal - so why use plastic?

i.materialise Material Portfolio
Sculpteo Material Portfolio
Shapeways Material Portfolio

[uncommonsense]

From i.materalize

8 Titanium: Light and the strongest 3D printing material in the world
9 Stainless steel: Not your grandmother’s stainless steel
10 Silver: Sterling silver
11 Gold: 14 carat solid gold
12 Prime gray: Very smooth, detailed and “luxurious” to the touch
13 Brass: Copper and Zinc, united as one
14 Bronze: What did you expect after gold and silver?
15 Ceramics: A food safe material that shines like no other
16 High detailed stainless steel: High grade stainless steel with a superb level of detail

[The_Reader_David]

The point is to have a program that the first 3D printers which will be generally available can use to produce firearms. Metal printers are much more expensive and use more expensive feed-stock.