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What about getting a house with conduits for hvac, electric, and plumbing, and still get it cheaper than 3d?

Construction technologies to make lowrise housing super duper cheap are already here: panels, lgsf, large prefabs, light concretes

And for really tall highrises, they are already coming within 50-40% of their materials costs in Asian countries. So for them, it will make no difference even in the most optimistic case.

You can't do much physically about price of steel and cement, other than finding ways to use less of them.

From the pictures it looks like there’s more than enough space for that in the walls, they are mostly empty.

Plus easier maintenance!