Batch sizes - umnikos/hopper.lua GitHub Wiki

There's some weird setups where you need an item transfer operation to only occur when said operation has a specific size. An example would be feeding a furnace exactly 8 items at a time to smelt, to ensure you never waste coal. That's where the following flags come in handy:

• -batch-multiple [number] - Every transfer operation must involve an amount that's divisible by the number supplied.
• -batch-min [number]/-min-batch [number] - Every transfer operation must involve an amount that's at least as big as the supplied number.
• -batch-max [number]/-max-batch [number] - Every transfer operation must involve an amount that's at most the supplied number. It's currently an alias for -transfer-limit [number] -per-slot but that's not exactly identical so it might change in the future

Example: hopper *chest* *furnace* -to-slot 1 -batch-multiple 8 - Feed furnace items to smelt in a way that ensures no coal is wasted