The U.S. Army's Detroit Arsenal in Warren, Michigan, is piloting a facility retrofit project that wraps existing building exteriors with 3D-printed panels. Funded by the Environmental Security Technology Certification Program (ESTCP), the project aims to cut heating and cooling energy consumption by more than 65%. John Cupp, director of public works at Detroit Arsenal, said the project is intended to validate advanced additive manufacturing on existing military facilities to improve energy resilience and maintain uninterrupted operations. The project uses terrestrial LiDAR scanning to capture millions of data points and build a millimeter-accurate digital twin of the building facade, allowing each panel to conform to the existing geometry. Blower door testing measured baseline air leakage, with retesting planned after installation. Direct Digital Fabrication printed the panels directly from 3D geometry files using robots and CAD data. The Army says the process uses one-twentieth the material and one-fifth the production time of conventional manufacturing. Because the panels are made off-site, contractors can install the cladding system without the interior demolition and office relocations typical of conventional insulation retrofits. The demonstration aims to reduce heating loads by 50%; the Army estimates savings of about $3.98 to $4.84 per square meter per year and greater feasibility for electrified heating in extreme cold climates. The project is scheduled for completion in 2027, and the data will inform whether the Department of Defense rolls out 3D-printed cladding systems across its global facilities. The pilot extends additive manufacturing beyond prototypes and parts production to building envelope retrofits, providing a defense-facility-level validation scenario for large-format extrusion and robotic additive processes using polymers or composites. For the metal additive manufacturing supply chain, its significance lies in opening a new application area—energy-efficiency retrofits of existing buildings. If later versions incorporate metal connectors, fastening structures, or metal functional layers, demand for the relevant powder categories and printing services will follow. Value for powder buyers: (1) Monitor the expansion of material systems for large-format robotic additive manufacturing in building retrofits and assess in advance the powder compatibility of metal connectors and structural components; (2) Track the DoD's rollout decision after the project's completion in 2027 to judge whether a scaled procurement window will emerge; (3) Connect with service providers capable of LiDAR digital twins and off-site printing to secure future supply opportunities for metal components supporting cladding systems.