Copy-Item
by mcjava20
Copy-Item is a NeoForge block that duplicates an item fed into it, with the copy count set in a config file, for players who want more stacks from a single input.
What it does
The Copy-Item block takes an input item placed in its box and copies it. Once a redstone signal activates the block, it produces copies of the input item until the box is full, and the input item is not consumed when it already exists in the box. Players who do not want the input consumed can place an iron block in the box to keep the original. Items can be taken out of the box with a funnel, which makes it possible to feed the output into the next machine.
The number of copies per run is set in the config file config\copyitem-common.toml, found in the mod menu of the game. The copyAmount value sets the multiplier, with a maximum of 64 and a minimum of 1. Changes take effect after the game is started with the mod installed. The block is only needed in the world where it is used, and it is available in the creative inventory.
Copy-Item is built for NeoForge and published for Minecraft 1.21.1 only, with version 1.0.0 from 2026-02-03. The server and every player need the mod installed. The source code is public and the mod is released under the MIT License, which makes it open source.
Key features
Redstone-activated duplication
A redstone signal starts a copy run, and the block keeps producing copies until its box is filled.
Configurable copy multiplier
The copyAmount value in copyitem-common.toml sets the copies per run, from 1 up to 64.
Input item handling
The input item is consumed only when it does not already exist in the box, and an iron block keeps it in place.
Funnel output
Copies are removed from the box with a funnel, so the duplicated items can feed another machine.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who run automated factories or storage setups on NeoForge 1.21.1 and want a block that multiplies an item, and server owners who want the copy amount limited in the shared config.
How it compares
Duplicating Table is a NeoForge mod for 1.21.4 only, with the same client and server environment and under All rights reserved, so it is not open source. Advanced Research is NeoForge for 1.21.1 like Copy-Item, with client and server environment, under the MIT License and open source. Cheez Its targets 1.21.4 and is released under All rights reserved, so it is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Copy-Item | NeoForge | 1.21.1 | Client and server | 2026-02-03 |
| Duplicating Table | NeoForge | 1.21.4 | Client and server | 2025-04-24 |
| Advanced Research | NeoForge | 1.21.1 | Client and server | 2026-07-09 |
| Cheez Its | NeoForge | 1.21.4 | Client and server | 2025-10-08 |
Questions
Does Copy-Item need to be installed on the server?
How is the number of copies changed?
Which loader and version does Copy-Item support?
In the catalog
Copy-Item is one of 4,058 Storage mods on ModsFinder, and one of 1,794 Storage mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
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What the author says
mod配置： 这个模组可以配置复制倍数 你只要在游戏里的mod菜单里，找到配置就能改复制倍数，最大64倍，最小1倍。 不想进游戏里的mod菜单里，你确保游戏装着这个mod启动过，那么可以在"config\copyitem-common.toml"找到配置文件，里面的内容如下： When you are in the creative mode, when you open your backpack, there is an additional item, the name is: copy the item, which contains a square. It can be synthesized with the…
Official listing
- Modrinth page
- modrinth.com/mod/copy-item
- Owner
- mcjava20
- Published
- 2026-02-03
- Updated on Modrinth
- 2026-02-03
- Facts verified
- 2026-10-15