


🟠 Copper Hopper (Regulator Fork)
A fork of Copper Hopper by pcal43 that adds "Keep Last Item" functionality!
📦 Original Mod: Copper Hopper on Modrinth 🔧 Fork Maintainer: @AlpineOpponent
🧐 Why this fork?
The original Copper Hopper is amazing for filtering items, but it has one flaw for automation: It drains the chest above completely.
If you are using Copper Golems, Item Frames, or Visual Sorting Systems, you often need to keep at least one "bait" item in the source chest so your system remembers what belongs there.
This fork solves that problem by turning the Copper Hopper into a smart Regulator. 🧠
✨ New Features
🛑 The "Stock Keeper" Buttons
Inside the Copper Hopper GUI, you will now see small toggle buttons next to each of the 5 filter slots.
These buttons control how the hopper pulls items from the container directly above it (Chest, Barrel, etc.).
| Icon | Mode | Description |
|---|---|---|
| ⬇️ | Drain All (Default) | Standard behavior. The hopper will pull every matching item from the chest above until it is empty. |
| 🛑 | Keep Last Item | The hopper will pull matching items but STOP when there is exactly 1 item left in the chest above. |
🛠️ How to Use
- Place a Copper Hopper underneath a Chest or Barrel.
- Open the Hopper GUI.
- Place your filter item (e.g., Raw Iron) in a slot.
- Click the small button next to that slot to toggle it to 🛑 (Keep Last).
- Watch as the hopper drains your excess iron but leaves the last one behind for your Golems! 🤖
💡 Perfect For...
- 🤖 Copper Golem Sorting: Keep one item in the chest so the Golem always knows the chest is "assigned."
- 🔥 Furnace Arrays: Prevent your input buffers from running completely dry.
- 🖼️ Item Frame Systems: Keep your storage organized without manual refilling.
⚖️ License & Credits
- Original code and concept by pcal43.
- Forked and modified by AlpineOpponent. (and Google Antigravity hehe)
- Licensed under the MIT License .
Check out the original project to support the creator! 👇 https://modrinth.com/mod/copper-hopper
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.2, 1.21.3, 1.21.4
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as copperhopper-AlpineOpponent-keepOneInChest-Fork-0.19.1+1.21.10-prerelease.jar — drop this file into the mods folder
- Download size: 53 KB
- Download link checked 7 Sept 2026 — working
These come from our own check of the pack file, not from the source page.