CopperHopper (Regulator Fork)
CopperHopper (Regulator Fork) turns the copper hopper into a regulator that pulls items from the container directly above a chest barrel and keeps a set amount in place.
What it does
The fork is built from Copper Hopper, where a player places the hopper underneath a chest or barrel and sets a filter item, such as raw iron, in the hopper's GUI. Items matching the filter are drawn from the container above. This regulator version adds buttons that govern the pull rate, and a Keep Last Item option leaves one item behind so a golem or an item frame never runs out of a source. Players use it to keep storage organized without manual refilling, for example when Copper Golems sort items and need a single bait item source chest that remembers what belongs there.
The mod is a Fabric mod released under the MIT License. It is not open source. Files exist for ten game versions, and the latest Fabric file, 0.19.1+1.21.10-prerelease, is marked as a beta build for 1.21.11. A server running it needs every connecting player to have it too. Furnace arrays and item frame systems can keep their input buffers from running completely dry.
Key features
Regulated pulling
The hopper draws items from the container directly above it and stops once a set amount is kept in the source.
Keep Last Item
An option holds back the final item in the chest so golems and item frame setups keep a bait source.
Filter item slot
A filter slot in the hopper GUI selects which item the hopper moves, such as raw iron.
Adjustable pull buttons
Buttons in the hopper GUI govern the pull rate from the container above, letting players tune how fast items are taken.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x10 of 10 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who run automated storage, Copper Golem sorting or item frame systems on Fabric and want a hopper that stops draining its source.
How it compares
Copper Golem Extension is server-side only, with files for 1.21.9 – 1.21.10, and all rights are reserved. Smart Copper Golem is server required with the client optional, open source under the GNU Affero General Public License v3.0 only, and built for 1.21.11. Copper Chest with Minecart runs on client and server under the MIT License, with files for 1.21.11 only.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| CopperHopper (Regulator Fork) | Fabric | 1.21.2 – 1.21.11 | Client and server | 2025-12-22 |
| Copper Golem Extension (CGE) | Fabric | 1.21.9 – 1.21.10 | Server-side only | 2025-10-12 |
| Smart Copper Golem | Fabric | 1.21.11 | Server required, client optional | 2026-01-21 |
| Copper Chest with Minecart | Fabric | 1.21.11 | Client and server | 2026-08-27 |
Questions
Does CopperHopper (Regulator Fork) need the server?
Which Minecraft versions does the fork support?
How does the Keep Last Item option differ from the original?
In the catalog
CopperHopper (Regulator Fork) is one of 3,932 Transportation mods on ModsFinder, and one of 2,390 Transportation mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
A fork of Copper Hopper by pcal43 that adds "Keep Last Item" functionality! 📦 Original Mod: Copper Hopper on Modrinth 🔧 Fork Maintainer: @AlpineOpponent
Official listing
- Modrinth page
- modrinth.com/mod/copper-hopper-keep-one-item-fork
- Owner
- AlpineOpponent
- Published
- 2025-12-22
- Updated on Modrinth
- 2025-12-22
- Facts verified
- 2026-10-15