Auto Smelter farm, All versions.

1. Add 2 chests.

2. Add 8 Hoppers in a donut shape and all eventually connecting to the chest.

3. On top of each hopper, place a furnace that most perferably has it's face sticking outwards so that you can tell if its active or not.

4. On top of each furnace add a hopper connecting to the furnace under itself so that you can transfer items into the furnace.

5. On top of the hoppers, add regular rails on the corners and powered rails in between.

6. On one of the rails, place your minecart with chest and add your redstone block on the top of the centre and push your minecart with chest making it ride in circles and hitting every hopper.

7. Split your fuel into eights (1/8) or however many furnaces you have placed.

8. Put each group of fuel into each furnace so that they are all equall.

8. Place the item you want to smelt inside the chest that's inside the minecart. This will later be transfered to the hoppers and then into the furnace.

9. And now, when the item is done smelting, it should get transfered to the hoppers below the furnace and into your chest.