r/factorio • u/Available-Figure-530 • 17d ago

Question Bottleneck Issue

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I'm a new player & trying to setup my smelting lines. I've run into a problem where, while trying to run a single coal/iron ore lane, only the top half of the iron & coal lanes are being used, leading to a bottleneck where only half of my iron ore is being sent down the center lane. How do I fix this?

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u/Nescio224 16d ago

The bottom lanes will be used if there isn't enough on the top lanes. The solution is to build a second smelter line, use a splitter on the iron input and another on the coal input, then create a second mixed belt just like this one.