Lance Cpl. Devin Kato, a small arms repair technician with II Marine Headquarters Group, inspects his final product during the 3D printer class at Marine Corps Base Camp Lejeune, North Carolina, June 2, 2016. Additive manufacturing, or 3D printing, allows Marines to produce parts quickly, with exact specifications and at almost any location. - Lance Cpl. Devin Kato, a small arms repair technician with II Marine Headquarters Group, inspects his final product during the 3D printer class at Marine Corps Base Camp Lejeune, North Carolina, June 2, 2016. Additive manufacturing, or 3D printing, allows Marines to produce parts quickly, with exact specifications and at almost any location.