I would love to have a metal material that is cheaper than, or around the same price as ShapeWay's steel options, but suitable for smaller detailed models like D&D or wargaming miniatures. The detail level of brass/bronze is fantastic, but of course, very expensive. I don't know if the cost of Shapeway' copper alloys are driven by the cost of copper or because of the complex 5-step used to make them. I would love to be able to offer customers an attractive looking but cheap metal material. I know a lot of miniatures are cast in pewter, such as Ral Partha's. Most of history's pewter was 90% tin and 10% lead, but modern pewter is usually made lead-free out of 92% pewter, 7.5% antimony and 0.5% copper. Other combinations exist. My understanding is that lead is not dangerous as long as it doesn't get in your mouth, but that might be a legal hassle that Shapeways would rather avoid. I'm assuming that the lower melting point of pewter would reduce the costs of working with it. Unfortunately, and this a surprise to me, it seems that Tin costs 3x as much as Copper right now. Another cheap, low melting point metal is Zinc. I'm less familiar with this material or its alloys, except that pennies are made out of it (only the outer coating is copper), and pennies are generally known for being cheap, sturdy enough and finely detailed. Zamak, white metal and pot metal are popular zinc alloys. Aluminum is the poster child for cheap metals, but it seems dubious since Aluminum is not used for small detailed models. However, aluminum alloys might be suitable for 3D printing, such as Magnalium or Silumin. Lead and cadmium are also inexpensive, but they are poisonous.