In Houston, Texas, a giant printer is halfway through building what designers say is the first 3D-printed two-story house in the US. The machine has been pouring a concrete mix from a nozzle to create a 4,000-square-foot home. Project architectural designer Leslie Lok, co-founder of the design firm Hannah, says her team aims to eventually scale up their designs to efficiently 3D print multifamily homes and offer customized design on a mass scale without excessive labour costs. The three-bedroom home is a two-year collaboration between Hannah, Germany-based Peri 3D Construction and Cive, an engineering and construction company in Houston. Hikmat Zerbe, Cive's head of structural engineering, calls the two-story house a "big laboratory."

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