It seems cool but it's really just printing a frame right? It's not going to print the plumbing, electrical, HVAC, roof, septic, etc. That's where a lot of the big costs for material and labor come in. I suspect this is why we haven't seen this take off. Modular homes seem to have become popular and seem like a much more realistic way to mass produce homes because they can be made assembly line style in one place and then assembled on site.