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Module TypeReliant
Created byBloo
Last Updated byAndante, BluePsychoRanger, Kroppeb and Misode
Complementary ModulesRelocators
Compatible MC Versions1.8, 1.15+

This module allows the creation of special smelters which cause ore smelting to output double items.


When a furnace with the proper multi-block structure smelts an ore or other supported item, the Smeltery will output an additional smelted item. If the Smeltery's output has no room for the additional item (i.e. has 63 items before the smelt is completed), then the extra item will not be generated.

Every doubling smelt has a 1 in 90 chance to fill the cauldron with lava. This means if a smeltery is continuously run, it can be self-sustaining.

Below is a list of items that can be smelted and doubled by a Smeltery.

Input Output (x2)
Copper Ore Copper Ingot
Raw Copper
Nether Gold Ore Gold Ingot
Gold Ore
Raw Gold
Iron Ore Iron Ingot
Raw Iron
Sand Glass
Red Sand
Chorus Fruit Popped Chorus Fruit


The Smeltery can be crafted in a Custom Crafter with the following recipe:

Item Ingredients Recipe (Custom Crafter)
Smeltery Cobblestone +

Furnace +

Iron Ingot +


Custom Crafter

Multi-Block Structure

In order for the Smeltery to properly function, a structure must be built around it. A cauldron must be placed behind the Smeltery. 7 iron blocks must be placed in the surrounding blocks to complete a 3x3 square and an additional layer of 7 iron blocks should be placed above that.


Advancement Requirement
Serious Smelter
Construct a Smeltery
Have a Smeltery in your inventory


Smelteries can be moved with Relocators.

Learn More and Download

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Version Date Change
1.8 21 May 2014 Released Blast Furnaces
1.15 20 Mar 2020 Beta version of Blast furnaces 1.15 was installed on Public Server 6
27 Mar 2020 Module renamed to "Smelteries" to be unambiguous with vanilla blast furnaces
04 Aug 2020 Publicly released Smelteries for 1.15
Removed Diamond, Emerald, Lapis, Coal, Redstone, and Quartz from the doubleable items
1.16 29 Aug 2020 Added Nether Gold Ore as a valid item.
29 Nov 2020 Smelteries drops a custom block when moved with Relocators
1.17 03 Aug 2021 Added Copper Ore, raw ores, and deepslate variants
1.18 23 Apr 2022 Custom Crafters is now a library and no longer needs to be downloaded separately
Smelteries are now crafted as items instead of upgraded from custom crafters
Updated crafting recipe
"Serious Smelter" advancement trigger changed to picking up a Smeltery
Smelteries will drop as an item when broken instead of the crafting components
Multi-Block changed to use a cauldron instead of a hopper in the center
Smeltery is now the actual furnace block; items are no longer spawned above the hopper, but instead get directly doubled within the furnace output
Smeltery process has a chance to generate lava in the cauldron present in the new multi-block

Previous Versions

MC 1.8-1.17 Versions

Prior to 1.18, the recipe used to be

Custom Crafter

Crafting a Smeltery converted the Custom Crafter into a Smeltery, which was a hopper. This hopper was the center of the multi-block structure instead of a cauldron. The doubled output item would spawn in above the hopper instead of doubling directly inside the furnace. Prior to 1.18, smelting items in a smeltery did not generate lava. Additionally, breaking the Smeltery will dropped the items used to create the Smelter, though when destroying a Smeltery, the player would not get the iron block back, but would instead get a hopper.