Besides the fact that you have in the end a "worse" building compared to traditional construction or prefabricated, 3D house printing may be an idea in first world countries where you can this way reduce man work (spending instead on the machines/technology).
It makes little or no sense in less rich countries where not only workers are (relatively) cheap, but there is unemployment and hiring people to manually build houses actually contributes to the local economy.
If you want an example of (very fast) building "terrible" houses, there was the "balloon" method that dates back to the sixties (and is actually very efficient/fast/costy saving):
https://en.wikipedia.org/wiki/Binishell
Only for the record a "modern" approach to similar "dome" houses (but pre-fabricated):