Designed by architect Leslie Lok, co-founder of Hannah, a 4,000-square-foot, two-story home that will be 3D-printed is under construction in Houston, Texas, and will take a total of 330 hours to complete printing.

“You can actually find a lot of 3D-printed buildings in many states,” Lok said. “One of the things about printing a second story is you require, you know, the machine. … And, of course, there are other challenges: structural challenges, logistic challenges when we print a second-story building.”

The three-bedroom home with wooden framing is about halfway finished and is being sold to a family, who wish to remain anonymous, she said.

The project is a two-year collaboration by Hannah, Peri 3D Construction, and Cive, a construction engineering company.