Nope 3d printers requires a lot of power, still requires a lot of construction by hand doors windows plumbing electric, insulation, sewers etc and each location has its own soil conditions that need to be analyzed for each new development.

Also 3D printer is not cheap, it requires one of a kind machines, transport assembly and calibration by specialized technicians and to have concrete preparation scheduled to the minute so it can flow to the machine.

You just simply can’t have one type of housing plan, because people still care for aesthetics, and don’t want cookie cutter homes. And honestly, there is no guarantee that just because you can build cheaper that’s gonna sell cheaper to the public, that’s the most naive misconception about 3d housing.

You can build a Tesla and use anywhere in the world, but you can’t just buy a 3d house and just drop it in every single market. It’s a tremendous labor consuming effort.