For something like making copper cables, I use the 16 bucket tanks from Ender IO to transfer rubber into my Assembling Machine. The problem is, copper cable requires 144 mb of rubber per cable, and if you do the math, that means one Ender IO tank of rubber can make 111.1111 cables. See the problem? The fractional leftover means I'll have a very small amount of rubber left in the tank when I'm finished. To solve this problem would mean having to use 9 tanks of molten rubber, and I'd have to make 1000 cables at a time which is just too many obv.
Couldn't you just make sure you make up the rubber in multiples of 9 and not necessarily fill the eio tank?