the RepRap is a self-replicating machine (3D printer) created by Adrian Bowyer.
Look at your computer setup and imagine that 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, think 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.
There are RepRap machines around the world these days. LtU readers are invited to report their experiences!
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