In test performed by a British Navy ship, a drone was printed in 3D, on board a navy ship and successfully flew. 3D printing on board of large vehicles offers many advantages of flexibility and cutting costs.

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http://www.technologyreview.com/news/539586/british-navy-warship-tests-a-3-d-printed-drone-at-sea/?utm_campaign=newsletters&utm_source=newsletter-weekly-computing&utm_medium=email&utm_content=20150723