[KaiserPro]

Much as this is innovative I cant help but notice there isn't any insulation in these homes.

Sure, you have 6inches of concrete, but that just makes it more expensive to build.

From what I can see, its probably cheaper and quicker to pour ICF(https://en.wikipedia.org/wiki/Insulating_concrete_form). They are basically uber insulative, super quick to build, and support multiple floors in one pour.

The only way I can see the "3d" printed approach being either Eco(cheap) or Eco (earth friendly) is using doing a rammed earth/adobe system. At least then you only really need to dig up earth, power the machine, and boom, you have walls.

[daenz]

According to this[0], there is insulation filling the gap between the inside and outside walls.

0. https://youtu.be/QCWKJvsqjb4?t=549

[lancesells]

I wonder what it takes to change the layout of your house. Removing a wall seems a lot more difficult when there's 6 inches of concreate than a traditional home.

[bilsbie]

Could they have a second print head for expanding foam?

[was_a_dev]

Cavity wall insulation would be easier