3D printers rest on a table at the SparkX Cell Innovation and Idea Center on Joint Base Andrews, Md., Apr. 8, 2020. Each printer can print up to four facemasks at a time, depending on the model created. Printers can print one facemask in as little as three hours with one hour of post-processing. (U.S. Air Force photo by Airman 1st Class Spencer Slocum)