I hope 3-D printing becomes obsolete when robots can achieve the same efficiency with using the standard construction materials. That should take away all benefits of 3-D printing over regular builds.
You don’t need a robot, especially in the colloquial sense meaning humanoid. Better additive manufacturing techniques than desktop FDM printers exist, and CNCs can turn these parts out from much better materials all day.
3D printing isn’t entirely about automation, it’s also a way to get shapes that are impossible to manufacture traditionally. Modern rocket engines almost all use 3D printing because the shapes are so highly optimized.
You're against additive manufacturing because you want robots to become craftsmen? That's... a pretty wild take, to put it mildly.
I'm curious, what are "standard construction materials" and "regular builds" to you? And what do you think those robots are made of?