Parts made with 3D printing technology are apparently robust enough to be used in fighter jets.
http://www.bbc.co.uk/news/uk-25613828 (http://www.bbc.co.uk/news/uk-25613828)
I wonder if you can download the plans for a Tornado off the internet ;)
Without looking, I'd hazard to guess that The Pirate Bay already has it as a torrent. ::)