.@calestous: Key 3D printing patent expired this year, making the technology freely available http://bit.ly/1xtBxD9 pic.twitter.com/hN3a3OHHze
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.@calestous: Key 3D printing patent expired this year, making the technology freely available http://bit.ly/1xtBxD9 pic.twitter.com/hN3a3OHHze
MT @calestous Key 3D prntng patnt exprd Jan'14; tech now freely availbl http://bit.ly/1xtBxD9 pic.twitter.com/KJcy89udXz Surprsd - 15 yrs old
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