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Bug Open

Priority splitter not prioritizing the priority output

aviemet · Sep 2, 2026

I set a splitter as a "Priority Splitter", with a line of outputs going to 2 different productions lines. The splitter has a total available amount at 1300/m to split among the 2 lines. One line "wants" 1500, the other line "wants" 433. No matter what configuration I use, the entire output gets sent to the line wanting 1500. Using the priority vs overflow outputs makes no difference. The only way I can restrict how much gets sent is by setting the belt speed going to the 1500 line. Thank you

1 comment

  • Xuqari maintainer · Sep 14, 2026

    I have spent a good while on this one and I cannot reproduce it, so I need your help. I built your setup seventeen different ways: 1300 into a priority splitter, one line wanting 1500 and one wanting 433, machines and sinks, hubs in between, the splitter flagged before and after wiring, the lines auto-sized and pinned. In every single one the priority side was filled first, 433 to priority and 867 to overflow. Could you share the plan, or a screenshot of the splitter with both lines? There is one part of your report that IS working as intended, and it may turn out to be the whole thing. If the priority port feeds the line that wants 1500, then sending it all 1300 is correct: an overflow port only ever receives what the priority side cannot take, and a line wanting 1500 will swallow 1300 without blinking. The planner explains that nowhere, which is my fault, not yours. But if you had priority on the 433 line and it still received nothing, that is a real bug and I very much want to see it.

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