I have just learned that in Germany you wouldn't be able to print a house because of existing rules, especially regarding energy efficiency.
Isn't it possible to print an insulating inlayer to fulfil this standard?
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Of course it is possible to meet the energy efficiency standards - the article itself suggests that 3D printed houses have the potential to exceed traditional building methods for efficiency.
The point that the article is making under the "Deutschland tut sich schwer mit dem 3-D-Druck" heading, is that there are just a lot of regulatory hurdles. Paperwork. Not only does your potential 3D printed house need to be suitably efficient, but you need to prove to the authorities that it will be, before you've built it, or you won't get a permit to start the building.
For such a new technology with little existing data to draw upon, convincing those in charge that your design meets all of the standards (energy efficiency is just one example) will be extremely difficult, and explains why research into this area is not a priority for the established house builders in the country.