Yes, I saw a while back where the Chinese were producing small, concrete, 3D printed homes to meet housing shortages. Quite innovative indeed.
IANAE (engineer), but I'd think hollow would be great for running plumbing/electrical. And I seem to remember from one of the many shows on the History Channel that it's the rebar rusting that usually causes concrete to crack and fail in big structures...so long as it's only a single, maybe double level home, I'd think this method would be plenty strong...and the speed would hopefully mean cost-effective as well.
Years ago I saw a video on making hemispherical structures by inflating big balloon thingies and pouring concrete over them--I'd think this would be better, as you could design whatever internal shapes and room sizes you'd like to have and just let the printer build it--no weird corners, off-true construction, etc, etc.
Monolithic Domes
I like these... I've been inside the one they call "Charca Casa", there at Italy, TX. I'd love to live in one like it.
I think the really cool versions of this are (or will be) the proposals to send great big self-deploying 3-D printers to other planets, where they will use local soil plus maybe on-board binder to 3-D print living structures for the humans that follow months later.