Create Dupe Fix
by Kl_Asdk
Create Dupe Fix is a NeoForge server-side utility that patches item duplication exploits in the Create mod and its add-ons on 1.21.1.
What it does
The mod closes gaps that let players gain items unfairly while using Create together with Create Aeronautics and Copycats+. Its fixes target a physical bearing combined with an Item Drain, storage containers on a moving contraption, decorative blocks attached to a bearing, and a chain drive conveyor that duplicated items when a chain was removed quickly. Each fix is listed by the author as a specific bug, so a server owner can see which exploits are covered.
The aim is a fair game with more stable survival and multiplayer sessions, since the exploits removed here would otherwise let players obtain resources without earning them. The mod is server-side only, so players join without installing anything. It is released under the MIT License and is not open source. Files are published for NeoForge only, and the newest is 1.21.1-1.2, updated on 2026-08-05, for 1.21.1 only.
Key features
Item Drain bearing fix
Stops resources from being duplicated when an Item Drain on a physical bearing contraption processes items.
Storage on moving contraptions
Containers and tanks on a moving physical structure no longer drop extra items when they are disassembled.
Decorative blocks on bearings
Signs, torches, buttons, kelp and similar blocks attached to a physical bearing are no longer duplicated while the structure moves.
Chain drive sync fix
Closes a synchronization gap that duplicated items when a tensioned chain was removed quickly from a chain drive conveyor.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Multiplayer servers
Server owners who want to remove duplication exploits from Create-based builds can install the mod on the server alone.
Who it’s for: Server owners running Create with Create Aeronautics or Copycats+ on NeoForge 1.21.1 who want item duplication closed without changing the rest of the modpack.
Questions
Does Create Dupe Fix need to be installed on the client?
Which game versions does Create Dupe Fix support?
Does Create Dupe Fix cover Create Aeronautics?
In the catalog
Create Dupe Fix is one of 36,990 Utility mods on ModsFinder, and one of 13,477 Utility mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
A lightweight utility mod designed to address and patch critical item duplication exploits and physics glitches when playing with Create, Create Aeronautics, and Copycats+. Have a safe and exploit-free game with Create Dup Fix!
Official listing
- Modrinth page
- modrinth.com/mod/create-dup-fix
- Owner
- Kl_Asdk
- Published
- 2026-07-13
- Updated on Modrinth
- 2026-08-05
- Facts verified
- 2026-10-15