"What can survive blazing temperatures of almost 6,000 degrees Fahrenheit without melting? What did not break apart at extreme pressures? What is made by a new process that forms a complex part in just one piece? What takes less than three weeks to go from manufacturing to testing? What can reduce the costs of expensive rocket parts by 60 percent or more?
Answer: 3-D printed parts
Engineers know that 3-D printed rocket parts have the potential to save NASA and industry money and to open up new affordable design possibilities for rockets and spacecraft. But until recently, no one had tested rocket parts critical to engine combustion in a hot-fire environment."
Marc's note: I believe SpaceX has already tested 3D printed parts in a hot-fire. Nonetheless, the premise of saving money by using 3D printed parts is the focus of the story and is a cost-saving measure that will reduce the cost of flight.