SpaceX's latest space capsule which they unveiled yesterday actually features 3D printing. In fact one of the most important parts on the spacecraft is 3D printed. The engine combustion chambers for the 8 Superdraco thrusters are created using a direct metal laser sintering process. By using 3D printing to create these parts SpaceX was able to save a tremendous amount of money and time. Check out a picture below of the Superdraco Thruster firing. Inside the thruster there is an a combustion chamber 3D printed from a nickel chromium alloy material called Inconel:



Pretty cool if you ask me, that such an advanced company is relying on 3D printing for such an important aspect of this spacecraft. More details here: http://3dprint.com/4740/spacex-dragon-2-3d-print/