Montana has become the first state to grant broad regulatory approval to the use of walls made by 3D printing—also known as additive manufacturing—in building construction.

Building regulators in Montana have okayed 3D-printed walls as a replacement for walls made via concrete masonry units (CMUs) or standard cored concrete blocks. The approval was granted in an application from a housing contractor in Billings, the state's largest city.

Tim Stark, who filed the application, will use Florida-based Apis Cor's 3D printing system to complete a project building single-family housing in the city.

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