3-D printing could remake U.S. manufacturing     • Manufacturers
are increasingly using 3-D printers, made by ExOne in Irwin,
Pa., to make production parts, rather than just product
prototypes.      Jeff Swensen, for USA TODAY   Jeff Swensen, for
USA TODAY   Sponsored Links  But there are no clanging hammers,
wheezing presses or even computer-controlled milling machines.
Instead, a dozen 3-D printers quietly stitch together industrial
parts by meticulously spreading hundreds or thousands of layers
of powdered metal onto a canvas until they form three-
dimensional shapes.  The machines look and function like
document printers. They run automatically. A lone operator
occasionally adds powder, programs the design of a new part into
a computer or removes the finished object.  This minimalist
factory exemplifies the latest chapter of the industrial
revolution, one that could make U.S. manufacturing more
competitive globally and could bring more jobs back to the
United States.  Just as it transformed music, TV and