clipped from: reprap.org 
"Wealth without money..."
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"The promise of advanced fabrication technology that can copy itself is a truly remarkable concept with far reaching implications." "[RepRap] has been called the invention that will bring down global capitalism, start a second industrial revolution and save the environment..." "Money is a sign of poverty."
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Look at your computer setup. Imagine if you hooked up a 3D printer. Instead of printing on bits of paper this 3D printer makes real, robust, mechanical parts. To give you an idea of how robust these parts are think of Lego bricks and you're in the right area. You could make lots of useful stuff, but interestingly you could also make most of the parts to make another 3D printer. That would be a machine that could copy itself.
