Sable Assembly Fix
by xiao-ou6630
Sable Assembly Fix stops block entities from duplicating their items when Sable assembles or disassembles a structure on NeoForge 1.21.1.
What it does
Sable can move a block into a sub-level and back, and in some setups the items inside a block were copied: one copy dropped to the world while another was saved in the block's NBT and read back after the block was recreated. The mod targets that duplication during assembly and disassembly, so block entities that do not implement Clearable no longer leave their contents behind to be copied.
Block entities that implement Clearable, such as chests and hoppers, already clear correctly and pass through unchanged. Modded containers like keg cabinets, baskets and item drains may not implement Clearable, and for those the mod clears the contents itself. A block entity ID whitelist can be set to skip the fix for specific types, which may need a configuration edit and a game restart or reload.
The mod requires Create, Create Aeronautics and Sable. It is server-side only, so only the server needs it and players join without installing anything. The mod is open source under the MIT License, and files are published for NeoForge 1.21.1 only, with 1.0.0 as the latest file dated 2026-07-19.
Key features
Duplication fix during assembly
Items inside a block are no longer copied when the block is moved into a sub-level and recreated.
Handling of non-Clearable containers
Block entities that do not implement Clearable, including some modded containers, have their contents cleared by the mod.
Block entity ID whitelist
Specific block entity types can be listed in the configuration to skip the fix.
Native Clearable handling kept
Block entities that implement Clearable go through the normal path, so their behavior does not change.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 3
How it compares
Sable Sub-level Loading System Fix is a NeoForge 1.21.1 mod that runs on client and server and is not open source under the MIT License, so both sides must install it. Aeronautics Display Link Fix is open source under the MIT License, server required and client optional, for NeoForge 1.21.1. Sable Explosions Fix is server required and client optional, under the MIT License, but not open source, with files for 1.21.1 – 1.21.11.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Sable Assembly Fix | NeoForge | 1.21.1 | Server-side only | 2026-07-19 |
| Sable Sub-level Loading System Fix | NeoForge | 1.21.1 | Client and server | 2026-08-20 |
| Aeronautics Display Link Fix | NeoForge | 1.21.1 | Server required, client optional | 2026-07-05 |
| Sable Explosions Fix | NeoForge | 1.21.1 – 1.21.11 | Server required, client optional | 2026-07-10 |
Questions
Does Sable Assembly Fix need Sable installed?
Does a player need the mod on their client?
Why would a container need a whitelist entry?
In the catalog
Sable Assembly Fix is one of 3,545 Optimization mods on ModsFinder, and one of 1,250 Optimization mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from xiao-ou6630
Similar mods
What the author says
Plus any modded BE with inventory that doesn't implement Clearable. Add block entity IDs to the whitelist to skip the fix (e.g. if a mod handles Clearable on its own). Requires a game restart to reload.
Official listing
- Modrinth page
- modrinth.com/mod/sable-assembly-fix
- Owner
- xiao-ou6630
- Published
- 2026-07-18
- Updated on Modrinth
- 2026-07-19
- Facts verified
- 2026-10-15