A small number of MiG-29 Fulcrum fighter aircraft are being upgraded in Poland with new mission computers, navigation technology and radios, and at Military Aviation Plant No. 2 , designers and engineers are using 3D printers manufactured by Zortrax to design and test a variety of parts. The teams there says the technology has significantly reduces the time needed to carry out the upgrades. Zortax says that specific components can be machined within a couple of hours following the completion of their 3D printed prototypes. Once a design passes a series of tests, production of the newly created elements begins on a small scale. You can read the whole story here: http://3dprint.com/88176/zortrax-pri...fighter-planes

Below is a picture of the MIG-29: