Simple Dupe plugin. It contains a config which you can set the undupables.
Set anti-dupe to the custom model data of you're undupable. Then add the custom model data you just made anti-dupe to on the desired item.
Contact me here for support: https://discord.gg/T9pBQthbaR
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.19.4
- 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.
Verified by MCModsHub
- Ships as Dupe.jar — drop this file into the mods folder
- Download size: 10 KB
- Download link checked 29 Aug 2026 — working
These come from our own check of the pack file, not from the source page.