Factorio Blueprints

Takes a belt of half plastic and half green circuits on the outside and a belt of copper in the middle. Older designs used two belts of copper. However, since stack inserters were added to the game, only a single belt of copper is necessary.

Based on older designs like this one. https://www.reddit.com/r/factorio/comments/3sdtvl/updated_octagon_advanced_circuits/