Rock Island Arsenal Uses 3D Printing to Reinvent Military Manufacturing

Rock Island Arsenal in Illinois is blending centuries-old forging traditions with modern 3D printing technology to keep the U.S. Army’s supply chain strong. Inside its historic foundry, workers still pour molten steel into molds, much as they did more than a century ago. A short distance away, the hum of robotic arms and printers signals a new era. The site is becoming a key hub for advanced manufacturing, where old and new techniques work side by side.

One of the most transformative changes is the introduction of sand 3D printing for mold production. Previously, creating a traditional wooden mold could take months of careful work. With the new system, molds can be printed in as little as 24 hours and poured the following day. This ability to iterate rapidly allows the Army to deliver critical parts in days instead of months, improving both flexibility and readiness.

Rock Island Arsenal is also home to the world’s largest 3D metal printer. (Photo Credit: US Army)

The benefits of additive manufacturing extend far beyond speed. Rock Island has been experimenting with new alloys and more precise mold techniques, making production more efficient and adaptable. The arsenal recently achieved AS9100 certification, which positions it to produce aerospace-grade components and support both Army and Air Force aviation programs. This certification opens doors for high-precision applications that demand strict quality standards.