Industrial-scale 3D printing…pretty cool:
Video at the link.
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@ devhammer -
How about a Jet Engine
http://www.gereports.com/post/118394013625/these-engineers-3d-printed-a-mini-jet-engine-then/
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Very nice. I know a guy (Jeff Prosise, whom some of you Windows dev folks might be familiar with) who flies R/C Jets, and would probably love to build his own engines from scratch. I’m thinking the laser-sintering 3D printer might be outside his budget, tho. 
Why do 3D printing when you can build one from a turbo 
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