There are two huge problems with housing and why not everyone has one.

Property taxes and death taxes.
Property taxes are pure evil.  They are a perpetual rent that you have to pay for the luxury of sleeping in a nice place.

And death taxes.  We don't want the children to inherit anything real... like a house, so we must make them sell it.  And thus put more in the mortgage pool.

Remember, if you are not upper class nobility, you are not allowed to own any assets.  Its called Real Estate because its the kings estate.

And the 3D print house is expensive for its size.  Its shape is not conducive to people furniture.  You can do a lot better with rammed earth adobe.