Print me a Stradivarius
How a new manufacturing technology will change the world
Feb 10th 2011 | from The Economist
THE industrial revolution of the late 18th century made possible the mass production of goods,
thereby creating economies of scale which changed the economy—and society—in ways that
nobody could have imagined at the time. Now a new manufacturing technology has emerged
which does the opposite. Three-dimensional printing makes it as cheap to create single
items as it is to produce thousands and thus undermines economies of scale. It may have as
profound an impact on the world as the coming of the factory did.
It works like this. First you call up a blueprint on your computer screen and tinker with its shape
and colour where necessary. Then you press print. A machine nearby whirrs into life and builds
up the object gradually, either by depositing material from a nozzle, or by selectively solidifying
a thin layer of plastic or metal dust using tiny drops of glue or a tightly focused beam. Products
are thus built up by progressively adding material, one layer at a time: hence the
technology’s other name, additive manufacturing. Eventually the object in question—a spare
part for your car, a lampshade, a violin—pops out. The beauty of the technology is that it does
not need to happen in a factory. Small items can be made by a machine like a desktop printer, in
the corner of an office, a shop or even a house; big items—bicycle frames, panels for cars,
aircraft parts—need a larger machine, and a bit more space.
At the moment the process is possible only with certain materials (plastics, resins and metals)
and with a precision of around a tenth of a millimetre. As with computing in the late 1970s, it is
currently the preserve of hobbyists and workers in a few academic and industrial niches. But like
computing before it, 3D printing is spreading fast as the technology improves and costs fall. A
basic 3D printer, also...