@john @lain this video provided a fair skepticism: https://www.youtube.com/watch?v=sz1LM9kwRLY

It only 3d prints the walls, which are far less than 95% of the house. The walls are concrete, which cannot be smoothed or nailed into or have cabinets hung on without significant human labor. Cracking and weather sealing is a big problem. It's not even cheaper.

The big examples that people have done are frequently not even real (prefabricated elsewhere or touched up by hand), and never include a 3d-printed 2nd floor, because that's not possible to do.