If you could build a 3d printer that could lay down PVC pipes to heating/hot-water spec, that would revolutionise construction in the way that a concrete printe

If you could build a 3d printer that could lay down PVC pipes to heating/hot-water spec, that would revolutionise construction in the way that a concrete printer seems unlikely to do. If you could do walls/floors/plumbing/electrics in one machine in one pass, it would change the world in ways that are hard to imagine - this would completely change the economics of construction projects. Nobody's done those yet, sadly. They seem difficult things to design.