In this Phase I SBIR, Geofabrica Inc. will advance the Modular Assembly Shelter (MASh) Kit technology developed by U.S. Armys Construction Engineering Research Laboratory (ERDC-CERL) engineers. (MASh) Kit that leverages pre-engineered construction, additive construction and 3D printing techniques. The company will develop the foundations for a method for fabricating MASh Kit components using 3D printers/additive manufacturing systems that may be transported to austere locations. This will give the Army the opportunity to rapidly and flexibly fabricate an improved generation of Rigid Wall Shelters on location. During Phase I, Geofabrica will validate the complete MASh Kit solution including design, fabrication techniques, and structural integrity. It will also project needs and opportunities for changes to Army supply logistics for Rigid Wall Shelters. Geofabrica is ideally suited to advance the MASh Kit technology. Geofabrica specializes in developing and commercializing additive manufacturing technologies for the Department of Defense and commercial use. 26 of Geofabricas 31 employees are scientists, engineers, manufacturing specialists and technicians. Over 20% of its employees have advanced degrees. The company has deep experience in developing expeditionary manufacturing systems and large-scale fused granulate fabrication and fused deposition modeling additive manufacturing systems. The company is under contract to produce expeditionary manufacturing equipment for the Department of Defense, and builds and operates large scale additive manufacturing systems relevant to this SBIR.