3D printing dates to 1950s with robotic bricklaying followed by pumped concrete in the 1960s. In mid 1990s the technology gained traction and now is feasible.
Moreover, 3D printed houses on a small scale indicate prices at less than $30/sf. Based on recent evaluation a standard home will cost more due to the MEP requirements of the home, but frame, finish, and time to be significantly less than traditional building.
The 3D construction should be able to provide a more affordable way to build homes while lowering costs at least $10 per square foot compared to a traditionally built home using lumber.