The latest Space-X unmanned Dragon mission is set to deliver 5000 pounds of cargo to the International Space Station today. On board is a 3-D printer designed to test the concept of making parts in space from raw materials, a much more efficient process than either sending parts on demand, or stocking potentially unnecessary parts in anticipation of repairs. Obviously such a scheme relies on a significant number of parts being made of the same raw materials, but it’s an intriguing idea.
Source: Fox News
MechanizedIntelligence 
It was only a matter of time before they decided to try and use 3-D printing technology in space. It is incredibly efficient and will cut costs considerably. Here’s hoping it works!