Pascal Martinelli, one of the engineers who worked on the Rosetta comet-chaser project with CNES and NASA, says his agency picks out the best engineering students in France a dozen times a year to work on various elements of the Janus Project. This project, the EyeSat, used a total of 400 3D printed parts to work out elements of the final design, and the team ultimately decided to include some of those parts in the final satellite. You can read the whole story here: http://3dprint.com/37270/student-eng...erospace-parts
Check out the finished product, built with much help from 3D printing, along with the team who spent a ton of time working on it: