Interesting link, thanks.

I was talking more about using a 3d printer to make a mold, then melting down metals to create your own castings. A small foundry kit where the printer makes the mould, you pack the sand, then you melt down alumnium cans or scrap steel, pour and get yourself a metal object.

I recently saw a segment on the show 'manlab' where they cast their own lemon squeezer - vid is poor quality but here: http://www.youtube.com/watch?v=jtFkn4gRt-M