We sell the 3D printers, but there only good really for stuff like plastic, wax shapes etc as the medium has to flow through the print heads, then it just builds up layers as the heads pass over it in a cross section. Beinag able to pass liquid metal type media will be when it comes into some real uses.
The interesting thing i seen talk about lately is the food machine, it has the core powdered "materials" by basic elements. and when dispensed in the right order/quanity etc should be able to make up a stack of differant items. They are currenlty working on it being able to " print out" a pizza.