DupeChest (Duplication Chest/Dupe Chest)
by Vix.
DupeChest, by Vix, adds a Dupe Chest block entity that copies the items placed inside it, with NBT data preserved, for players at the end of a Fabric survival or server progression.
What it does
The Dupe Chest is a custom block that duplicates the items placed in it and mirrors the contents of its inventory. Items carrying NBT data are copied as well, so enchanted books, shulker boxes, a dragon egg, a dragon head, a mace, a conduit, a music disc and a creeper head can all be duplicated, along with enchanted golden apples and armor trims.
Crafting the block takes a shapeless recipe of nine items, all of them among the rarest in the game. The recipe becomes available only after a player defeats the strongest bosses, raids the deepest structures and gathers the required components, which is meant to keep duplication behind end-game progression. The mod is released under the MIT License and is open source, with a public source code repository and an issue tracker for reports and pull requests.
The mod runs on Fabric for Minecraft 1.21.11 and is published as fabric-1.21.11-mcVIX-1.2.4, dated 2026-02-04. It is a client and server mod, so the server and every player need it installed. The Economy category lists 460 mods with Fabric files for 1.21.11, and DupeChest sits alongside several other duplication and item-copying tools.
Key features
Mirrored chest contents
The Dupe Chest mirrors what is stored in its inventory and duplicates items placed inside it.
NBT-aware copying
Items with NBT data are copied intact, so enchantments, contents and trims carry over to the duplicate.
Rare item duplication
Dragon eggs, dragon heads, mace, conduit, Pigstep, creeper and piglin heads and enchanted golden apples can be duplicated.
Recipe book entries
The Dragon Egg recipe and other end-game recipes appear in the recipe book automatically once the required items are gathered.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Cactus Dupe is a Fabric duplication tool for 1.21.1 – 1.21.5, a client and server mod released under All rights reserved and not open source. Item Duper is a Fabric client and server mod for 1.21.11 only, also under All rights reserved and not open source. Magic-Endless Mirror is a Fabric client and server mod for 1.21.8 under the MIT License, which makes it open source, like DupeChest.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| DupeChest (Duplication Chest/Dupe Chest) | Fabric | 1.21.11 | Client and server | 2026-02-04 |
| Cactus Dupe | Fabric | 1.21.1 – 1.21.5 | Client and server | 2025-04-12 |
| Item Duper | Fabric | 1.21.11 | Client and server | 2026-08-01 |
| Magic-Endless Mirror | Fabric | 1.21.8 | Client and server | 2025-08-28 |
Questions
Does DupeChest need to be installed on the server?
Which loader and game version does DupeChest support?
Is DupeChest open source?
In the catalog
DupeChest (Duplication Chest/Dupe Chest) is one of 2,072 Economy mods on ModsFinder, and one of 1,159 Economy mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from Vix.
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What the author says
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. To begin your journey into the matrix, you must defeat the strongest bosses and raid the…
Official listing
- Owner
- Vix.
- Published
- 2026-02-04
- Updated on Modrinth
- 2026-02-04
- Facts verified
- 2026-10-15