Taking advantage of a short visit to the Netherlands, we decided to visit the Wikkelhouse factory. These small houses or Tiny Houses are prefabricated houses with biodegradable material, using a special technique for the manufacture of their structures. Although is not a common 3D printed house, I believe their fabrication methods gets quite close to it: a huge machines produces layer by layer the skelleton module for each house.
The company that makes them, Fiction Factory has a wide range of similar products.
https://wikkelhouse.com/
