Hi, I'm sorry, but I don't speak English, I use a translator. I use all Bob's and Nagel's mods and MSPs. I came across an error. Science package 3 and 4 use the Vial item for their production. It is produced in mixing furnace. And mixing-furnace is in alloy processing technology, which needs a scientific package 1-4 for its research. It would probably be easiest to move production to stone furnace.