As I see it there is no problem if one item is lacking. But depending on consumption there can be a deadlock when that item later comes back. Because then for example the red flasks that are too frequent on the sushi belt can't be put back on the belt and stop the sushi belt. Have it running for +2...

I made some improvements to avoid problems when you run out or don't have a specific science pack. The idea is to use an item as buffer (I used copper ore for testing). I am using Warehouse Mod and Loader Redux, if you don't wanna use those just replace the warehouse and loaders by a few chests (I t...