I was in Barnes and Noble looking at the machining magazines and heard a
lady looking at the art magazines telling her son about metal clay.
Basically you make a part with the clay let it dry, and fire it in a kiln or
with a torch, the binder melts away leaving the metal part.

http://en.wikipedia.org/wiki/Metal_clay

I was wondering if it would work for iron, steel, or stainless. Possibly
the clay could be extruded from a 3-D printer.

RogerN