U.S. Air Force Tech. Sgt. Rogelio Lopez, 60th Maintenance Squadron assistant aircraft metals technology section chief, uses a computer to transfer data to the Stratasys F900 three-dimensional printer Aug. 15, 2019, at Travis Air Force Base, California. Travis AFB is the first field-unit location in the Air Force to have the Stratays F900 3-D industrial printer certified by the Federal Aviation Administration and Air Force Advanced Technology and Training Center for use on aircraft replacement parts. (U.S. Air Force photo by Louis Briscese)