You can't "print" wiring & plumbing. I understand the concept, but it just doesn't work that way. Even if you could get the copper molten enough to flow, it's not going to just "stick" to the previous layer like resin does. To bond metal, both ends have to be hot, and pressure applied.
Assuming you used pvc for the plumbing and could effectively print that, there is still no suitable substitute for #10/#12 copper used to wire homes today.
The idea is essentially the same thing as thinking you can fly by strapping on a giant pair of wings to your arms and jumping off a cliff. Might look like cool if you've never heard of it before, but in practice it's just ridiculous.