Thought you guys might like this, it's pretty cool. http://www.abc.net.au/news/2015-02-26/australian-researchers-create-first-3d-jet-engine/6262462
Just to be clear that's just a small turbine working as an auxilliary power unit, not something that would actually propel an aircraft. But then it's just a proof of concept, and a rather impressive one too. I wonder how the properties of 3d-printed metal compare to traditional forging - a turbine\jet engine is a very demanding environment.
Turbines usually have Inconel or other nickel super alloy combustion chambers.. that stuff is almost indestructible and a real bitch to make things out of, if they can print that it would be a real feat...
NASA is already testing 3D Engines and has had very good success. One day an entire 3D printed rocket will lift off from the planet with the first humans aboard.