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Pictured is an up-close view of a petal orifice liner created at Arnold Engineering Development Complex Hypervelocity Wind Tunnel 9 in White Oak, Maryland, using additive manufacturing, otherwise known as 3D printing. The liner is integral to high Mach number tunnel runs at Tunnel 9 and can experience temperatures of several thousand degrees. The refractive metal part has an outside diameter of around 3 inches, an inside diameter of around 2 inches and is nominally 3 inches in length. Additive manufacturing machines at Tunnel 9 are also capable of much larger prints, in the ballpark of 18 to 24 inches in any direction. (U.S. Air Force photo)
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