AUTOMATIC SMELTER ARRAY

Materials List

Overview: what the Automatic Smelter Array is and does

An array of furnaces fed by hoppers that automatically distributes items to smelt and collects the output. Scales from 1 to 16+ furnaces. Uses no redstone, purely hopper mechanics.

As a utility build it automates a processing job — smelting, brewing, composting, or generating a resource — to save repetitive manual work. It is a beginner-friendly build: the wiring is forgiving and a first-time redstoner can finish it in one sitting.

It fits in roughly 2W x 8L x 4H (for 8 furnaces) and works in Minecraft 1.5+ through to the current 1.21 release.

How it works: the redstone mechanics

This build is pure hopper logistics with no redstone: a hopper on top of each furnace feeds raw material, a side hopper feeds fuel, and a bottom hopper drains the smelted result to a chest. An input chest distributes items along the chain so every furnace fills in turn.

The core parts doing the work are furnace, hopper, chest, and building Blocks; the remaining materials are structure and wiring that hold those pieces in the right relationship.

Because it automates a processing step, the limiting factor is the machine's own cycle time, and the redstone simply has to feed it in the correct order and rhythm.

How to build it

1. 1Place a row of furnaces side by side.
2. 2On top of each furnace, place a hopper pointing into the furnace (item input).
3. 3On the side of each furnace (fuel slot side), place a hopper pointing into the furnace.
4. 4Below each furnace, place a hopper pointing toward a collection chest.
5. 5Place an input chest on top of the first input hopper, items distribute along the chain.
6. 6Place a fuel chest feeding into the first fuel hopper.
7. 7Items from the input chest flow through hoppers, filling each furnace in turn.
8. 8Smelted items drop into bottom hoppers and flow to the output chest.

Uses & applications

• ▸As a utility build it automates a processing job — smelting, brewing, composting, or generating a resource — to save repetitive manual work.
• ▸Built from 8× furnace, 24× hopper, 4× chest, and 16× building Blocks and more, it slots into a survival base as a beginner-level project.
• ▸Connect its input and output chests to a wider item network so it processes resources unattended.
• ▸Scale the array up by repeating the unit once the single version works.

Tips & common mistakes

• !Fuel and material must enter through the correct faces — top hopper for the item, side hopper for the fuel — or the furnace simply will not smelt.
• !Test the full cycle in a creative-mode copy first, then rebuild it in survival once you know the timing holds.
• !Remember a powered hopper is locked, not active — keep stray redstone away from the hopper lines unless you deliberately want to gate item flow.

Automatic Smelter Array FAQ