REDSTONEPEDIA › Circuits › Auto-smelters
Auto-smelter: furnaces fed from one input chest and one fuel chest
1 furnace · 4 blocks
Shares the items of its input chest out to its furnace, feeds them coal from its fuel chest and collects every result in its output chest, 6 items a minute per furnace.
Fuel it with coal or charcoal: other fuels, such as lava buckets or blocks of coal, may be shared out unevenly between the furnaces.
6.0 items a minute per furnace · its first result within 11 s · made of furnace, hopper · fits in 1×3×2
Every size 3
The best design for each size: pick one to see it.
| size | blocks | numbers |
|---|---|---|
| 1 furnace (this page) | 4 blocks | 6.0 items a minute per furnace · its first result within 11 s |
| 8 furnaces | 108 blocks | a double chest of raw iron in 72 min (100% of 8 furnaces) · ~8 stacks of coal · rests |
| 16 furnaces | 221 blocks | a double chest of raw iron in 36 min (100% of 16 furnaces) · ~8 stacks of coal · rests |
Try it
Watch the hoppers carry the items into the top of each furnace and the coal into its side; the results drop into the output chest (the numbers over each container show what it holds).
How this design does it: One furnace: the hopper under the input chest drops items into the furnace's top, the hopper under the fuel chest pushes coal into its side, and the hopper under the furnace takes each result down into the output chest.
Build it
Download .litematic Download the design as text
The .litematic opens in Litematica (Minecraft 26.3): every block of the design in one region. The text file is the same build written as plain text, block by block.
After building it, put a chest at ITEMS (the items to smelt), a chest at FUEL (the coal) and a chest at OUT (the results): none of them is in the download or its block count.
Details: how it works, measurements and properties
In depth
spreads the items of its input chest over its furnaces, feeds them coal from its fuel chest and collects every result in its output chest
How to try it
The smelter runs in the view: items to smelt start in the chest tagged ITEMS and coal in the chest tagged FUEL; hoppers carry them into the furnaces, and every result drops into the chest at OUT. The numbers over each container show what it holds; speed it up with the bar's speed dropdown. Drag to look around, pinch or scroll to zoom.
Measurements
| metric | value | what it means |
|---|---|---|
| items/min per furnace | 6.0 | items smelted a minute by each furnace at the steady rate (a furnace's own limit is 6, a blast furnace's 12) |
| first item | by 11 s | game ticks from loading the chests until the first result reaches the output chest |
| items per coal | 6.0 | items smelted for each coal burnt (a coal smelts 8 items in a furnace that never runs dry) |
| spread | 18 each | items each furnace smelted |
| hoppers awake | 3 | hoppers left unlocked at rest: each one looks for items every game tick (lag on busy servers) |
| at rest | yes | whether the build comes to rest once its work is done (no: it keeps running, like an elevator's clock) |
| blocks per furnace | 4.0 | blocks placed for each furnace |
| bill | 15 iron, 0 quartz, 0 redstone | what its blocks cost to craft: iron, quartz, redstone, slime |
Notes from its designer
One furnace: the hopper under the input chest drops items into the furnace's top, the hopper under the fuel chest pushes coal into its side, and the hopper under the furnace takes each result down into the output chest.
Properties
| Study | Auto-smelters |
|---|---|
| Kind | Auto-smelter: furnaces fed from one input chest and one fuel chest |
| Blocks placed | 4 (not counting the chests the view adds) |
| Box | 1×3×2 (6 blocks of space) |
| Made of (the blocks that change state) | furnace, hopper |
| Inputs / outputs | no input / OUT |
| Design file | smelter-1 |
The design file
Design file (21 lines)
# Auto-smelter: 1 furnace · 4 blocks # https://vjeux.github.io/redstonepedia/circuits/smelter/smelter-1.html name: smelter-1 circuit: smelter 1 port items: 0 3 0 port fuel: 0 2 1 port output: 0 -1 0 origin: 0 0 0 palette: D minecraft:hopper[enabled=true,facing=down] N minecraft:hopper[enabled=true,facing=north] F minecraft:furnace[facing=north,lit=false] layer 0: D . layer 1: F N layer 2: D .