Tutorials/Hopper – Minecraft Wiki
The hopper is a redstone component which can be used to manage items. To make the smelting process more efficient, it is possible to use hoppers to ensure a furnace is never left empty. In the shown schematic, chest A is for items such as uncooked meat, chest B is for fuel such as coal, and chest C holds the output. Since furnaces can hold fuel without a chest, chest B and its hopper are ...
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