The rolled copper and Iron are interesting in that their ratio's don't like up and they absorb materials that don't conform with the number. a full bag(80wt) of iron will produce 26 rolled Iron with no excess. (3.04ingots/roll), we as a back of 26 copper will produce 8 Rolls. in both cases they absorb 2 extra units of ingots. when modifying the inputs to 78 for the iron and 24 for the copper, you produce 1 less roll.
Just some initial feedback.