One-way item routing?

I’m planning to just use the oredict method described earlier and only allow 1/9 and 1/72 dusts into the dust collection area (it’s OK if the carbon can reach main storage because there won’t be item barrels for it anyway, I just don’t want it to go into the “unhandled dust” area). If I use a filter for each item to keep out then it’s harder to keep track of because I have to keep the filter in sync with the other parts of the base.

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