Item Duper
This adds the ability to dup items using 3 blocks, but these blocks are very hard to get the recipe. See more in the description!
⬇ Download on ModrinthItem Duper adds a powerful late-game duplication factory to Minecraft. Craft the Unfinished Item Duper using End Crystals and the Dragon Egg, finish the machine with obsidian and music discs, then build the correct setup: Item Duper -> Pole -> Item Duper Chest. Items placed inside the Item Duper Chest duplicate automatically every second while the machine is built correctly. If the chest overfills, the machine ejects its contents and explodes, so automation comes with risk. This mod is designed as an end-game reward. It is intentionally expensive, requiring rare materials such as the Dragon Egg, End Crystals, music discs, obsidian, redstone blocks, and netherite scrap
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.11
- 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 item-duper-1.0.4.jar — drop this file into the mods folder
- Download size: 28 KB
- Download link checked 5 Oct 2026 — working
These come from our own check of the pack file, not from the source page.