
DupeChest (Duplication Chest/Dupe Chest)
This mod adds a chest that duplicates/mirror the contents of your inventory. Infinite resources await, but only for those who conquer the end-game.
About this Mod

📦 DupeChest
DupeChest is a high-tier expansion that introduces the ultimate reality-bending utility to your Minecraft world. Rewriting the laws of the matrix, this mod allows you to duplicate your most precious items—at a legendary cost.
🌌 What's in the Mod
The mod centers around the Dupe Chest, a custom block entity designed for end-game progression:
- The Dupe Chest: A unique storage block that duplicates items placed within it.
- Short on resources? Missing that one piece of Redstone for a torch? Just dupe it!
- Left your stash behind? Forgot your 67 stacks of Emerald Blocks at home? Don't worry, just dupe 'em!
- NBT Support: It copies everything, including items with NBT data—meaning you can clone fully Enchanted Books and even entire Shulker Boxes!

🛠️ Crafting & Progression
To prevent world-breaking imbalances, the Dupe Chest requires a massive 9-item shapeless recipe consisting of the rarest artifacts in the game:


- Ingredients: Dragon Egg, Dragon Head, Mace, Silence Armor Trim, Music Disc (Pigstep), Conduit, Creeper Head, Piglin Head, and an Enchanted Golden Apple.
- Recipe Book: As soon as you obtain a Dragon Egg, the recipe will automatically unlock in your green recipe book.
🚀 Getting Started
To begin your journey into the matrix, you must defeat the strongest bosses and raid the deepest structures to gather the 9 required components. Once crafted, place the chest and witness the laws of reality rewrite themselves.
💬 Join the Conversation
Found a bug or have a suggestion?
- Report Issues: Use our GitHub Issues tracker to let us know.
- View Source: This project is open source! Check out the logic behind the duplication on our GitHub Repository.
🤝 Contributing
Looking to contribute? DupeChest is open source, and we welcome the community to help refine the matrix.
- Code Contributions: We accept bug fixes and feature improvements via Pull Requests.
- Building From Source: Clone the repo and run
gradlew buildto generate your own build files.
Available Versions
How to Install DupeChest (Duplication Chest/Dupe Chest) on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "DupeChest (Duplication Chest/Dupe Chest)". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
DupeChest (Duplication Chest/Dupe Chest) server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is DupeChest (Duplication Chest/Dupe Chest) compatible with fabric?
DupeChest (Duplication Chest/Dupe Chest) officially supports fabric for Minecraft 1.21.11. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with DupeChest (Duplication Chest/Dupe Chest) – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if DupeChest (Duplication Chest/Dupe Chest) consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Install DupeChest (Duplication Chest/Dupe Chest) with just one click on your server.