SlimefunCore
Custom unofficial Slimefun core build for Paper/Purpur 1.21.11 with Java 21 support, compatibility fixes, modern startup support, and stable loading for updated SF4 addons.
Slimefun 4.0v
Modified Version
Slimefun is a plugin which turns your Minecraft server into a modpack without installing mods. It adds a huge amount of content including advanced technology, powerful magic, machines, and full automation systems.
This is an unofficial modified version of the original project, maintained and updated by R2Ksanu.
>Original Repository: https://github.com/Slimefun/Slimefun4**
🌐 Community & Support
💬 Join the Official Discord Server 🔗
Spoiler
- 🛠️ Get support
- 🐞 Report bugs
- 📢 Follow updates
- 🤝 Talk with the community
- 🧪 Test upcoming builds
⚡ Slimefun4Core Community
Status Update
- Original version: 1.19.4
- Updated to: 1.21.11
- Compatibility: ✅ Working
- Status: 🧪 Success✅
- Tested on: Purpur 1.21.11 (Java 21)
This build is still under testing and may contain bugs. Feedback and bug reports are highly appreciated!
Future Update
Upcoming Slimefun community addons will also be updated for Minecraft 1.21.11 to work together with this main core build.
The goal is to keep the wider Slimefun addon ecosystem usable on modern Purpur/Paper 1.21.11 servers.
📜 Addons Info
What's New
- Dynamic addon list showing cloud-managed and manually installed addons
- Status overview with managed, loaded, and unmanaged addon counts
- Smarter GitHub jar selection — matches by addon name first
- Managed addon detection now reads directly from the jar's
plugin.yml - Fallback flags for remote sync are now fully respected
Commands
/sf addon list— lists all addons (managed + installed)/sf addon status— shows addon counts and sync state/sf addon sync— manually trigger a cloud config sync/sf addon enable <name>— enable a managed addon/sf addon disable <name>— disable a managed addon/sf addon update <name>— update a specific addon/sf addon download <name>— download a managed addon/sf addon remove <name>— remove a managed addon
| Addon | Status | Notes |
|---|---|---|
| Community Addons | ⏳__ %30 | updates for 1.21.11 |
| Main Slimefun Core | ✅ Updated | Working on Purpur/Paper 1.21.11 |
Note: This is an unofficial fork. Always test on a backup server before using on production.
Screenshots
(Reused from the original project – showcasing the power of Slimefun)
| Reactors & Electricity | Awesome Factories | Magic & Altars |
|---|---|---|
 |  |  |
✨ What is Slimefun?
Slimefun adds:
- Advanced technology systems
- Magical items and crafting
- Machines and automation
- Over 500 custom items
The original project started in 2013 and has grown into a large community project with hundreds of contributors.
This unofficial version keeps the spirit alive while bringing full support for the latest Minecraft 1.21.11!
🧭 Quick Navigation
⚠️ Important Disclaimer
This is an unofficial fork and is not affiliated with the original Slimefun developers or team.
- All credits go to the original Slimefun Team.
- This project follows the GNU GPLv3 License.
- You are allowed to modify and share it, but you must give proper credit and keep the same license.
Original Project
Creator & Builder: TheBusyBiscuit
TheBusyBiscuit · he/him
Original Project Team: Slimefun Team
Repository: https://github.com/Slimefun/Slimefun4
🤝🏻 Credits
- Original Project Creator: TheBusyBiscuit
- Original Project Team: Slimefun Team
- Modified & Updated by: R2Ksanu
- Screenshots: Courtesy of the original Slimefun community
📄 License
This project follows the GNU GPLv3 License.
See LICENSE for details.
Thank you for using Slimefun 4.0v-UNOFFICIAL!
Enjoy your modpack-like experience on the latest Minecraft version! :tada:
Made with ❤️ for the Minecraft community
