ModsFinder

CU later

by TheluckyguyNL

CU later swaps copper into the recipes that use iron for redstone components, so copper gets a practical role in redstone builds.

FabricForgeNeoForgeQuiltServer required, client optionalCreative Commons Attribution Non Commercial Share Alike 4.01.21.2 – 1.21.11

What it does

Copper replaces iron in the crafting recipes of several redstone components. Rails of most types, hoppers, tripwire hooks and pistons, along with powered rails, are changed to use copper ingots in place of iron, and some other tweaks are included. Recipes that use four copper ingots and two gold ingots are part of the change, and a few recipes still call for iron.

The mod is a data pack, so it can be installed on a server or a single-player world without a loader-specific build. The author states the change was made so copper has a more meaningful purpose, and the pack treats the affected blocks as redstone components. Files are published for Fabric, Forge, NeoForge and Quilt, covering 1.21.2 – 1.21.11, with 1.0.0+mod for 1.21.11 as the latest file on each loader.

CU later is server required and client optional: the server must run it so the changed recipes apply, while a player may leave it out. It is released under the Creative Commons Attribution Non Commercial Share Alike 4.0 license and is not open source. The author notes a high chance of conflicts with other mods that change the same recipes.

Key features

  1. Copper in redstone recipes

    Rails, hoppers, tripwire hooks and pistons take copper ingots where the vanilla recipe uses iron.

  2. Powered rails with copper

    The powered rail recipe uses copper and gold, so copper appears in an additional redstone component.

  3. Data pack resource

    The changes are delivered as a data pack, with a resource pack build that reflects the altered recipes.

  4. Partial iron recipes

    Some recipes still require iron, so the change is not a full replacement across all redstone items.

Compatibility

Latest build for each game version and loader.

1.21.x10 of 10 versions with builds
1.21.111.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.101.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.91.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.81.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.71.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.61.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.51.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.41.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.31.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
1.21.21.0.0+mod1.0.0+mod1.0.0+mod1.0.0+mod
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

Copper Powered Rails is published for Fabric, Forge, NeoForge and Quilt across 1.17 – 26.2, and it is needed on the server, with the client optional, so a server can run it alone. It is released under the MIT License and is not open source. Purpose of Copper covers 1.17 – 1.21.8 on the same four loaders, is needed on the server, with the client optional, and is also under the MIT License, not open source. Anvil Repair is published for the same loaders across 1.21.9 – 26.3, has a server that must run it while players may skip it, and is released under the Creative Commons Attribution Non Commercial Share Alike 4.0 license like CU later.

ModLoadersGame versionsEnvironmentUpdated
CU laterFabric, Forge, NeoForge and Quilt1.21.2 – 1.21.11Server required, client optional2025-08-26
Copper Powered RailsFabric, Forge, NeoForge and Quilt1.17 – 26.2Server required, client optional2026-08-24
Purpose of CopperFabric, Forge, NeoForge and Quilt1.17 – 1.21.8Server required, client optional2025-06-03
Anvil RepairFabric, Forge, NeoForge and Quilt1.21.9 – 26.3Server required, client optional2026-09-20

Questions

Does CU later need a specific loader?

No. Files are published for Fabric, Forge, NeoForge and Quilt, and the data pack itself is also listed as a server platform.

Does the server need CU later for the recipes to change?

Yes. The server must run the data pack so the changed recipes apply, while a client may leave it out.

Will CU later conflict with other mods?

The author notes a high chance of conflicts and compatibility issues with other mods, most likely where they change the same recipes.

In the catalog

CU later is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 19,862 mods support Minecraft 1.21.11.

Game mechanics mods29,952Fabric modsMods for 1.21.1119,862

More from TheluckyguyNL

All projects
deepslate dubble1.18 – 26.3just raw debris1.18.2 – 1.19.2unsilkable1.18.2 – 26.3Peaceful Gathering1.21.9 – 1.21.11

Similar mods

Better Third Person1.16.4 – 1.21.8Sounds1.20 – 26.3Cut Through1.18.2 – 26.3Bad Wither No Cookie - Reloaded1.12.2 – 1.21.10Carpet1.14.4 – 26.3Client Tweaks1.12.2 – 26.3

What the author says

Been wanting to give copper a more meaningful purpose? with this pack all blocks that are considered "redstone components" have copper in their recipes there is also a resourcepack build in to reflect the changes
TheluckyguyNL, on the Modrinth page

Official listing

Owner
TheluckyguyNL
Published
2025-08-26
Updated on Modrinth
2025-08-26
Facts verified
2026-10-15

Tags

Game mechanicsCursedDecoration
Open on ModrinthCompare