This design actually seems pretty interesting - one of the advantages of additive manufacturing by printing is that the resultant parts can be made with a strong internal structure (triangles, honeycombs, etc.) while still being made of mostly air, an outcome that's difficult to achieve using molding/casting, forging, or subtractive manufacturing (milling).

I also suspect that the mostly-hollow walls have a decent R-value on their own.

I do wonder how this competes with straw bale / rammed earth, shipping containers, and other recycled, rapid prefab building manufacturing.

"Making cheap houses for the poor" seems to be a common design+architecture firm/student theme - does anyone know of any success/failure stories where these "cheap house" designs were applied in real life?