Factorio Forums

Whenever you have a blueprint with green and red circuit network wires and have the blueprint built by construction robots, the wire doesn't need to be provided. They are automatically generated from thin air.

Blueprints have never required wires to be built. That's an intentional simplification.

Yeah I discovered this during my marathon mod playthrough... it's really convenient when wires cost a fortune

Alright, after seeing this post, I'm going to be a good citizen and report this. I have a blueprint for a priority splitter (thanks to Steejo for coming up with it/popularizing it), and I was able to put it down in my current game without robots, and without even researching circuit networks, and it wired up the belts like they are in the blueprint, letting me adjust the conditions manually and set up the priority splitter. I'm going to assume mods can move this into its own topic if necessary, but if not I'm happy to start a new topic. Here's the blueprint string:
Steps to reproduce:
Start a new game (or remove the circuit network research from your current game), put down enough belts so they get wired together (look at the blueprint), put down the blueprint over top of the belts, and watch the wires get attached to the belts.