BL3 NoDuplicateCosmetics - Stop Duplicate Cosmetic Drops

FEATURES

• Filters already-owned cosmetics before loot selection on drop.

• Preserves each source's native, source-local loot graph and reachability.

• Mixed gear + cosmetic pools continue through the game's native resolver.

• An exhausted dedicated cosmetic branch produces no cosmetic from that branch.

REQUIREMENTS

• Borderlands 3

• BL-SDK / Oak Mod Manager 1. 11+

• Mods Base 1. 12+

• BL3 Mod Menu 1. 8+

Latest BL-SDK / Oak Mod Manager:

https://github.com/bl-sdk/oak-mod-manager/releases/latest

Official BL3 SDK installation guide:

https://bl-sdk.github.io/oak-mod-db/

INSTALLATION

1. Install latest BL-SDK / Oak Mod Manager

https://github.com/bl-sdk/oak-mod-manager/releases/latest

2. Download the main mod archive from the Files tab.

3. Extract NoDuplicateCosmetics.sdkmod from the downloaded archive.

4. Copy NoDuplicateCosmetics.sdkmod to:

Borderlands 3\sdk_mods\

5. Do not extract NoDuplicateCosmetics.sdkmod itself.

6. Start Borderlands 3.

7. Open the PythonSDK / Mods menu.

8. Enable NoDuplicateCosmetics.

Updating NoDuplicateCosmetics:

1. Fully close Borderlands 3.

2. Download the latest version of NoDuplicateCosmetics.

3. Replace the existing NoDuplicateCosmetics.sdkmod in:

Borderlands 3\sdk_mods\

with the new file.

4. Do not extract the .sdkmod file.

5. Start Borderlands 3 again.

COMPATIBILITY

• The mod does not replace filtered cosmetics with unrelated loot.

• Pool structure, source-local reachability, probabilities and selection counts remain unchanged.

• Coop Support: Unknown

AI DISCLOSURE

• The Python code for this mod was generated with OpenAI GPT-5. 6 Sol through an iterative research, development and debugging process.

• In-game testing, behavior verification and QA were performed by Last1SiN.

• This Nexus Mods page description was also generated with AI assistance.

• No third-party mod code or game assets are bundled with the mod. BL-SDK / Oak components are external requirements.

CREDITS

• Development: Sol / GPT-5. 6 Sol

• Design, testing & QA: Last1SiN

• BL3 PythonSDK / Oak Mod Manager:

apple1417 and the BL-SDK project contributors

SHOUTOUTS

Borderlands community

1. 0 — Initial release

• Added pre-selection filtering for already-owned cosmetics.

• Preserved native source-local pool structure, reachability, probabilities and selection counts.

• Added handling for mixed and nested cosmetic pools, including exhausted cosmetic-only branches.

• Added same-session ownership refresh and late-loaded source rediscovery.

• Added guarded restore behavior for compatibility with external weight changes.

• Added safe world-transition handling for old-world pool references.

• Coop Support: Unknown.