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Ol' Foundry

Adds a foundry block, similar to a blast furnace but can be sped up using lava or different fuel types. Produces slag as a byproduct of ore smelting.

Fabric
Loaders
Fabric
Downloads on Modrinth
1.4K
Followers on Modrinth
7
versions
11
Updated
June 9, 2026Jun 9
Published
in 2026
An automated foundry · swipe

At a glance

Runs on Fabric
For Minecraft 26.1.2
Needed in the game and on the server
Latest version — 1.0.10 from June 9, 2026
Requires Fabric API
License MIT — free
Where it's needed
In gamerequiredOn serverrequired

Needed both in the game and on the server

Game versions26.1.2

Ol'Foundry

One block. The Foundry smelts like a furnace, but faster with additionnal stuff.

cauldron Dripstone lava accelerator

Slag bricks and dripstone: put a slag bricks block between a lava source and a hanging dripstone tip above a cauldron. Lava drips through at 3× speed.

How it works

Any furnace fuel works. Speed depends on what you burn:

  • Most fuels — 1×
  • Coal / charcoal — 1.5×
  • Magma cream — 2×
  • Blaze rod — 3×

The Foundry also has a 4-bucket lava tank. Fill it and smelting doubles in speed — stacks with the fuel bonus, so a blaze rod with lava hits 6×. The tank drains while it works. Fill it by hand, via the bucket slot, or pipe lava in from the side.

Slag

Ore smelting drops slag as a byproduct. You can:

  • Reprocess it for iron or gold nuggets (lava in the tank gives an extra roll)
  • Craft it into slag bricks
  • Burn it as fuel, or compost it

Other bits

  • Experience banks until you pull the output, same as a vanilla furnace
  • Hoppers work per face: top feeds input, sides take fuel and buckets, bottom pulls output and slag
  • All recipes and byproduct chances are in JEI

Requirements

  • Fabric Loader + Fabric API
  • Minecraft 26.1.2
  • JEI optional

Source: github.com/lucienmc/ol-foundry — MIT


Translations: English, Français, Deutsch, Español, Italiano, Polski, Português (Brasil), Русский, 简体中文, 日本語, 한국어 — PRs welcome.

FAQ

How to install Ol' Foundry?

Install Fabric for your Minecraft version, download Ol' Foundry for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does Ol' Foundry support?

Ol' Foundry has builds for Minecraft 26.1.2.

Is Ol' Foundry needed on the server?

Needed in the game and on the server

License and source
MIT Licensefree to use and share with credit to the author
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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