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.
- Loaders
- Fabric
- Downloads on Modrinth
- 1.4K
- Followers on Modrinth
- 7
- versions
- 11
- Updated
- June 9, 2026Jun 9
- Published
- in 2026
At a glance
Needed both in the game and on the server
Ol'Foundry
One block. The Foundry smelts like a furnace, but faster with additionnal stuff.
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