Duper
Duper is a Forge magic block that duplicates items placed inside it when powered by redstone.
What it does
A chest-looking block copies the items put inside it while redstone power is applied. The block is crafted from eight iron blocks and an ender chest, and it is published for Forge on 1.20.1 only. Duper needs both the server and every player to run it, and it is not open source, being released under All rights reserved.
Key features
Item duplication
Items placed in the block are copied while it receives a redstone signal, with no separate machine needed.
Survival crafting
The block is made from eight iron blocks and an ender chest, so it can be obtained in survival without commands.
Economy warning
Because it multiplies items, the mod is a poor fit for servers whose economies must stay intact.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Questions
Does Duper need to be installed on the server?
Which Minecraft version does Duper support?
In the catalog
Duper is one of 7,216 Magic mods on ModsFinder, and one of 3,927 Magic mods for Forge. 34,764 mods support Minecraft 1.20.1.
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What the author says
This mod adds a chest looking block that duplicates items you put inside it when powered by redstone. Survival friendly, crafted with 8 iron blocks and an ender chest. WARNING: This is a gag mod, do not use this on servers with economies unless you want the economy to be destroyed.
Official listing
- Modrinth page
- modrinth.com/mod/itemduper
- Owner
- Spaceboy11411
- Published
- 2026-06-23
- Updated on Modrinth
- 2026-06-23
- Facts verified
- 2026-10-15