The moon and Mars may be a bit of a reach, but using the technology here on Earth has proven to be both viable and desirable. Yes, printing homes for the homeless that costs $400k isn't realistic by any means, but as the technology improves, the cost will decrease.
Additionally, the adaptability of this process makes it even more appealing. Making the cavity between the walls wider would provide more insulation properties making the homes more thermally efficient in extreme hot and cold climates, as well as making them more sound proof. Imagine how much more damage resistant they would also be in areas susceptible to hurricanes, such as the south east US.
The only downside I can see, at least initially, would be the cost in modifying or repairing anything after building. For example, adding another electrical outlet, or doing a renovation like adding another bedroom and bath. Yes, they too could be 'printed' but adding extra plumbing or electrical wiring could be prohibitive. Fixing a leaking pipe that requires removing a section of the wall would be equally daunting, especially to make it blend back in with the original surface.
Still, it's a very promising technology that if I were younger, I would be very interested in if looking at a new house.