This is interesting, however, the "140 hours" part misses the foundation. The "printer" is laid on flat, nicely prepped ground, and is essentially just putting

This is interesting, however, the "140 hours" part misses the foundation. The "printer" is laid on flat, nicely prepped ground, and is essentially just putting down walls. The foundation didn't take 140 hours to make, the concrete doesn't even have time to cure enough to bear load in 140 hours. 3D printing "solves" the easiest part of building. It doesn't mean the tech is useless, I guess it offers some freedom concrete blocks don't have, but it is far from a game changer. It reminds me of when I saw a multistorey parking lot being built next to where I worked. For a couple of months, it looked like nothing happened. I saw people working, but nothing came out of the ground except for a small concrete tower which became the main staircase. And then a few trucks arrived with cranes and concrete panels and after a couple of days, the parking lot was complete, except for finishing (paint, lighting, ...), which took another couple of weeks. So, while impressive, the "wall building" part of construction didn't take long.