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I just saw something very cool.
My next door nieghbour works for HP and bought home a prototype 3D printer.
He called my at about 3am to show me - He is like a kid with a new toy.
We printed out a scan of his house key.
It didnt work in the lock and for some reason had a horrid smell - but it was pretty impressive.
Give it a few years and it will be useful.
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