8 Lane Scissor Filter Sushi Bus for Fulgora

porgalorian · Post by **porgalorian** » Fri Jun 13, 2025 1:36 am

8 Lane Scissor Filter Sushi Bus for Fulgora

Hello yall

I have been spending a lot of time on fulgora in my latest playthrough, designing and redesigning factories. And I have finally come up with a design that can reasonably handle 8 full lanes of sushi goodness in a relatively compact form factor that I feel satisfied with. I looked around and couldn't find a design similar so I thought I would share.

Edit: Blueprint book

I have an updated version which includes a slightly more compact 8 lane 2 item splitter.

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: 06-12-2025, 17-23-16.png (2.26 MiB) Viewed 1200 times

The scissor filter can filter up to 2 full lanes of items from the bus. It works by filtering the chosen item towards the edges while temporarily creating 2 additional lanes in the middle for the rejected items to be pushed towards. Rejected items are pushed inwards while the filtered items are pushed outwards. Once the filtered items have left the sushi bus, I reverse the process with priority splitters, pulling all the remaining items outwards in order to be ready for the next scissor filter.

Limitations

The scissor filter was specifically designed for fulgora and is only rated for filtering items with a 25% concentration or less. If a specific type of item represents more than 25% of the throughput of the sushi bus for a prolonged time the bus will begin to stutter. The occasional encounter with high concentrations of items will be buffered out, but prolonged exposure to high concentrations of any one item will cause long term congestion. So the more sushi the better! In practice on fulgora this is more than adequate to keep the bus flowing.

Name

I didn't really know what to call this, but it kind of looked like a scissor lift when I had a full factory using it.

: 06-12-2025, 17-18-00.png (7.17 MiB) Viewed 1200 times

sparr · Post by **sparr** » Fri Jun 13, 2025 5:10 pm

This looks pretty neat. I have one question/concern though...

In the middle, there's one extra splitter not necessary to the functioning of the design here. It mixes the two temporary middle belts. I know that mixing sushi belts is generally good, but you aren't doing any other mixing here so this seems out of place. Why do you have that splitter, but not other additional belt mixing splitters?

sparr · Post by **sparr** » Fri Jun 13, 2025 5:14 pm

Have you considered parameterizing the blueprint so you can choose a new item all at once when placing it instead of having to edit a splitter then copy its settings each time?

sparr · Post by **sparr** » Fri Jun 13, 2025 5:15 pm

Have you tried pulling two different items, one or two belts each, in the same blueprint? I think interleaving two of these in a single blueprint might be significantly smaller than putting two copies of this end to end.

porgalorian · Post by **porgalorian** » Fri Jun 13, 2025 9:59 pm

In the middle, there's one extra splitter not necessary to the functioning of the design here

Yeah I just threw it in case for some reason one of the lanes on one of the belts started to back up it would have the other belt to dump buffer onto. I haven't noticed that being an issue in this specific design but it would occur on previous iterations of my 8 lane busses so It kind of got carried over. I'll take it out of my factory and see if any issues come up but i think you are right and its no longer needed.

Have you considered parameterizing the blueprint so you can choose a new item all at once when placing it instead of having to edit a splitter then copy its settings each time?

Thanks I was doing it a different hard way, opening up the blueprint and overriding the parameter manually each time. This was much better. I updated the blueprint thanks!

Have you tried pulling two different items, one or two belts each, in the same blueprint? I think interleaving two of these in a single blueprint might be significantly smaller than putting two copies of this end to end.

In previous iterations of the design I would put two filtered splitters back to back in opposite directions instead of using priority splitters and those were significantly smaller so it was definitely on my mind. I have been trying to accomplish a similar thing with this approach but my current results haven't actually resulted in a tight enough design that I feel satisfied with. I'm about 3 tiles shorter than using the single filter version. I'm still working on it because I think it can be improved.

: 06-13-2025, 14-51-47.png (1.51 MiB) Viewed 1027 times

sparr · Post by **sparr** » Sun Jun 15, 2025 3:36 am

This doesn't quite work, but it's as close as I could get to compacting two copies to overlap. I might revisit this. Thanks for the inspiration!

: 06-14-2025, 23-14-26.png (890.99 KiB) Viewed 901 times

porgalorian · Post by **porgalorian** » Sun Jun 15, 2025 5:11 am

I silently updated my original post yesterday to include a blueprint book but I've been running this design for the past few days and it's been working flawlessly. The key I've found is to compact the lanes between each filter as to allow for rejections to pass through seamlessly. Here i have a 2 item splitter followed by a 1 item splitter.

Blueprint book at time of this post:

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: 06-14-2025, 22-07-16.png (1.5 MiB) Viewed 863 times

Since I have a long bus and I'm chaining these one after another, I have just been carrying forward the 2 temporary lanes onto the next splitter, except for the final splitter where I force the two temp lanes to merge. Either one works though, it's just not having that merger at the end allows it to be 1 tile shorter, as it relies on using the next splitter in the chain.

This is the "full" 8 lane splitter, the final 2 splitters with the deconstruction planners set as their filter force the temporary belts to move.

: 06-14-2025, 22-04-05.png (1.57 MiB) Viewed 863 times

I need a different word than splitter to describe this. The word is being overloaded.

sparr · Post by **sparr** » Sun Jun 15, 2025 12:03 pm

I might call this a N-M Filter Splitter, where N is the number of belts of input and M is the number of belts of the target item(s?) you extract. So the vanilla splitter entity would be a 2-1 Filter Splitter and your original post is a 8-2 Filter Splitter.

This would pretty closely match the current terminology for a N-M Balancer, where a vanilla splitter is a 2-2 balancer and larger balancers require more splitters.

sparr · Post by **sparr** » Sun Jun 15, 2025 3:18 pm

I started concentrating on just 4 belts, with the expectation that there's plenty of space to get the outputs from the other side across the bus if you mirror this.

This was the best I could do for two items, which is simpler but I think one tile longer than your version. I like your version that compacts the lanes earlier.

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porgalorian · Post by **porgalorian** » Sun Jun 15, 2025 5:05 pm

This project ran through many iterations for me. Some of my earliest versions were very simply.

: 06-15-2025, 09-42-53.png (3.19 MiB) Viewed 698 times

I think it's a smart move to focus on the 4 lane Splitter. I've been running some frequency counters on fulgora and I typically see item densities peak at around 21% of total throughput, typically towards the end as my unused iron gears begin to represent a higher percentage of the total. So for a design to flow flawlessly we would need at least 21% of throughput buffer if we were to push all of those items off. A 4 lane splitter with a 1 lane buffer lane would provide 25% extra buffer, which is enough buffer, without being too much buffer. I also think 25% feels like a good number outside of the context of fulgora, though fulgora remains my primary focus.

This is actually one of the big issues I was running into with my 8 lane zig zag designs. With 1 buffer lane being used across 8 lanes of bus, there was only 12.5% of potential buffer, so whenever an item would begin to filter through, if that item represented more than 12.5% on the bus, there wouldn't be enough throughput for the other items to be pushed off to without running into stuttering.

A compact 4 lane splitter that can be chained horizontally to make a 8,12,16 lane splitter might actually be the ideal combination.

sparr · Post by **sparr** » Sun Jun 15, 2025 5:26 pm

Your last version can be made one column narrower on the left if you move the outputs farther down so the leftmost lane can cross under down by the other outputs. I failed to get a screenshot when I did it, though.

Good job continuing to optimize this! Makes me want to go back and try a sushi setup on Fulgora as well.

porgalorian · Post by **porgalorian** » Sun Jun 15, 2025 6:47 pm

Yeah you're right, I had changed the design to make it more aesthetically pleasing to me by moving the final compactor splitter up to join the rest. But going back to that first WIP design I am able to thin the total width down by 1 column, at the cost of making it thicker longer.

I don't know if it being 12 tiles wide for basically the entire length of the splitter is better than it being basically 10 tiles wide with a little nub that pushes it out to 13 for a blip. Probably though right? It's just weird because it's both thinner while also being bulkier. Kind of a weird tradeoff.

: 06-15-2025, 11-37-32.png (1.04 MiB) Viewed 660 times

I don't know how much of a practical improvement it is. On a full sushi loop it offers some more flexibility but it does still take up the same amount of space. It leaves enough room to still run power lines atleast, I like that.

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Tertius · Post by **Tertius** » Sun Jun 15, 2025 7:46 pm

Given the OP has Fulgora with trash recycling as use case, and the given filter sorts just 2 of all the material with a somehow large footprint, I propose a different approach. Very simple and very direct. Sorts 100% congestion free every material on almost zero footprint, easily extendable with more intermediates. Output the recyclers directly to active provider chests and request the material in requester chests to put them onto a belt, if you have a belt-based factory afterwards.

out.mp4: (7.49 MiB) Downloaded 32 times

This contraption consumes 240/s trash and sorts the output with about 330 active bots. Works as well if you don't have the fastest belts and inserters - just downgrade as needed.

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porgalorian · Post by **porgalorian** » Sun Jun 15, 2025 8:39 pm

I appreciate the contribution, and in factorio there are many different ways to build a factory. But I'm not looking for any general solution to fulgora, instead I'm focused specifically at using a Sushi Bus.

There are islands on this current save of mine that do that strategy where they presort the ingredients to form many non-sushi buses, but my current focus is to instead using a sushi bus as the backbone and only split off items when they are needed. In this example from my factory where I'm building supercapacitors and accumulators, both of them use batteries as an ingredient, but I'm not running a presorted battery line, instead I'm splitting batteries off of the sushi bus for each of them in a just in time fashion.

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Theoretically with what I have the 8 lane bus would support up to 480 items per second on green belts without stacking, whatever the recyclers are able to stack would be a bonus on top of that.

Tertius · Post by **Tertius** » Sun Jun 15, 2025 10:31 pm

It has some merit by just not sorting what comes out of the recyclers, however I was never able to successfully use sushi belts. I tried multiple times, but sooner or later they all did congest or get out of balance and were not able to recover. Just wanted to show an alternative, in the unfortunate case similar issues persist for you.

sparr · Post by **sparr** » Mon Jun 16, 2025 1:35 am

Tertius wrote: Sun Jun 15, 2025 7:46 pmI propose a different approach. Very simple and very direct.

FYI, this subforum is for no-circuits no-bots designs. This is where we come to show what can be accomplished with just belts, inserters, etc. There's a "Forum rules" dropdown at the top of each post with a summary.

sparr · Post by **sparr** » Mon Jun 16, 2025 1:54 am

Here's a variation of yours that doesn't require mirroring. One can take 1 belt of each of 2 items off a 4 belt sushi bus. Two copies of it in the same orientation, offset by one tile vertically, can take 2 belts of each of 2 items off an 8 belt sushi bus. I wasn't able to come up with a compact way to handle 3 or 4 of the 4-belt units, but I suspect it's possible. And now I'm wondering how tall you'd have to make it so that it would support arbitrary horizontal scaling... you'd need to make sure there were sections narrow enough to cross with an underground belt every second or third tile of height, which would take a lot of stretching out. Or, of course, just switching to red belts so the underground parts become trivial

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porgalorian · Post by **porgalorian** » Mon Jun 16, 2025 3:31 am

Tertius wrote: Sun Jun 15, 2025 10:31 pm It has some merit by just not sorting what comes out of the recyclers, however I was never able to successfully use sushi belts. I tried multiple times, but sooner or later they all did congest or get out of balance and were not able to recover. Just wanted to show an alternative, in the unfortunate case similar issues persist for you.

Thanks, I'm actually not having any issues. Everything flows seamlessly with no congestion or balance issues with the current design. As long as you prioritize recycling the bus over scrap the bus flows effortlessly. The big thing I'm trying to accomplish is minimizing the footprint. Ideally being able to split off 3-4 items in the same space an assembly line would take up or less, And for the most part I'm there now but I think there is still room for improvement.

The main benefit of using a sushi bus over presorting is throughput. If you have 8 lanes in the bus, you will be able to fully maximize all 8 lanes, pushing 480 items per second. But when you start to sort the items out you lose much of that throughput. If you dedicate an entire lane to blue circuits and can't fully saturate it each second than you have wasted throughput. Plus an sushi bus can support any number of items. So adding green circuits, copper plates, iron plates, and any number of quality variations won't require adding additional dedicated lanes, as they can all saturate the full 480/s throughput of the 8 belts. And that's before stacking of course.

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