This looks interesting - some serious potential for the wealthy scratchbuilder or kit manufacturer, someday.
http://www.autoblog.com/2007/02/02/desktop-fabricator-takes-diy-to-a-new-level/
M.I.T. invented this technology. They have a large one that uses lasers to cut paper into shapes and build them up in layers to build prototypes.Engine blocks, parts, even saw them do a murdered womans skull so they could sculpt it with clay to see what she looked like. Maybe one day we’ll have these at home and just buy the data to build an Athearn blue box off the net and fabricate it at home instantly.