3D Printing A Marine makes small adjustments to a 3D printer before loading a design during a class at Marine Corps Base Camp Lejeune, N.C., June 2, 2016. Additive manufacturing, or 3D printing, allows Marines to produce parts quickly with exact specifications and at almost any location. Marine Corps photo by Cpl. Justin Updegraff SHARE: Download: Full Size (1 MB) Credit: Cpl. Justin Updegraff VIRIN: 160602-M-TV331-115C.JPG Photo Gallery