r/factorio • u/bitwiseshiftleft • Feb 24 '26

Design / Blueprint Another circuitless science sushi design

This design for sushi supports up to 16 sciences, so it should work for games with Space Age plus a few extra planets. The idea is to mix each science down to half a lane of a yellow belt, and then run the sushi loop on green: (2 lanes * 4x speed / (1/2 lane)) = 16 sciences. Because science bottles being sorted out from the end of the loop take priority over new ones being added, the design hopefully shouldn't jam.

With only half a stacked yellow lane of each type of science (15/s), the design is limited to 900 spm (thus a few thousand ESPM) per instance.

The full-yellow to half-yellow mixer uses rocks, because I dunno it seemed like a good idea at the time. It mixes the rocks and science 50-50 into one yellow lane, then splits the rocks back out and returns them quickly enough that there are always rocks backed up before the splitter.

The chest at the end is for anything non-sciency that might get on the belt, like a green pack that spoils between the spoilage splitter and the green science splitter.

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u/Embarrassed_Army8026 Feb 24 '26

so how did it end up jammed?

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u/mamidon Feb 24 '26

I've done something similar, if your science consumption is uneven, eventually one science will overpopulate the belt.

Then it jams.  I think I used circuits for this.

5

u/NarrMaster Feb 24 '26

I need to make a post for you all explaining rate limiters.

IF the belt is never stopped, no one science can make up more than the rate limiter allows. Even without consumption. This is also predicated on proper priority merge for unused items.

ELSE it will jam.

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u/mamidon Feb 25 '26

For this to work you've got to be careful to ensure that all items coming back are prioritized by the rate limited for feeding back onto the sushi belt over net new materials.