This is interesting experimentation. However everything I see in 3D-printed houses seem very much built for the sake of being 3D-printer built. Technology in search of a problem to solve. And this is probably not far off the truth at this stage. Many people are also dismissive that see the productions and don't have enough imagination to see things possible here that are disruptive compared to what you do today.

Later years I have begun to see and appreciate the handcraft gone into masonry. The results are very decorative and the material used is very modular. You buy standard size bricks (but sometimes cut them). I would love to see 3d-printing include bricks in the process. And then advance them so much that the machines can build arches. This is just my idea. I think architects that are less interested in the 3D-printing technology and more interested in amazing architecture need to be involved and use it as a component in construction.