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Builders are constructing what is considered the first two-story 3D printed home in the US. The giant printer has been cranking out concrete for the 4,000 square foot, 3-bedroom home in Houston, Texas. After starting construction in July, the home is now halfway printed. Engineers say that have no plans to "beat the clock" because the home is helping them learn more about their huge printer's capabilities. I wanted to see how it's done, so I dug up this video to show you how a concrete 3D printed home was built...