prefab-custom-addon

Prefab ships with a handful of buildings. After a while you get bored of them.

This addon adds an extension pack system: press Z in-game to browse and download community-made packs, or press X to make your own.

Downloader — browse community packs, pick one, drops into prefab-extension/, ready to use next time you load a world.

Creator — local workspace mode. Fill in a form, pick an NBT, pick a cover image, a few clicks and you have a standard extension pack (with ZIP). Everything lives in prefab-work/ at your game root. Export NBT files using the vanilla Structure Block.

Requires: Prefab 1.0.7+, LDLib2 2.2+. Tested on NeoForge 21.1.233 / MC 1.21.1 / Java 21+.

Keybindings

Folder Layout

The workspace folder mirrors the published pack format:

prefab-work/
├── <pack_id>/
│   ├── information/
│   │   ├── <pack_id>.txt
│   │   └── cover.png
│   └── construction/
│       ├── <building_id>.nbt
│       ├── <building_id>.png
│       └── <building_id>.txt
└── <pack_id>.zip          ← auto-generated

Any change under prefab-work/<id>/ triggers an automatic repack into prefab-work/<id>.zip. To install a pack manually, unzip the file into prefab-extension/<id>/.

Dependencies

NeoForge 21.1.233 on Minecraft 1.21.1.