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3D builder/magician Psychobob - you've seen his stuff before - is selling these Portal-themed drinks coasters, so your companion coffee cup has somewhere to rest its weary butt.

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As we've just seen, 3D printers are pretty great for hobbyists and DIY toy-makers. But because the machines can make practically anything, they can make, well, practically anything. Including assault rifles. Which is going to be a problem.

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