Stackable Shulkers Fix
by KikuGie
Stackable Shulkers Fix corrects how shulker boxes behave when Carpet's stackable shulker option is turned on, for Fabric servers from 1.20.5 onward.
What it does
With Carpet's stackable shulker boxes enabled, comparators read a shulker's signal strength from its contents, and hoppers stop filling a stacked box as they would a single one. This mod addresses those faults. Unstackable items inside a shulker now give an output that can reach up to 897, while stackable items that fill all 15 slots now let full hoppers stop as expected. Filling over a stack of one slot is also corrected, and the output of unstackable items is no longer capped at 15.
The fix is a bugfix for the server side and changes nothing a player sees in the interface. Overstacked item filters are kept intact, so items stacked beyond their normal limit still match filters as before. Carpet must be installed for the mod to load, and Lithium can be added as an optional companion. The source code and issue tracker are public, and the code is open source under the MIT License. Files are published for Fabric only, across 19 release versions 1.20.5 – 26.3, with 1.7.9 for 26.3 as the latest file, dated 2026-09-15.
Key features
Comparator signal fix
Signal strength from shulkers holding unstackable items is calculated correctly, with output up to 897.
Hopper filling fix
Full hoppers stop filling a stacked shulker at 15 slots, as they do with ordinary shulker boxes.
Output cap removed
Signal output for unstackable items is no longer limited to 15, so readings reflect the actual contents.
Overstacked filters preserved
Item filters keep matching overstacked items, so existing contraptions continue to sort the same way.
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x12 of 12 versions with builds
1.20.x2 of 2 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Use cases
Who it’s for: Server owners running Carpet with stackable shulker boxes, and players who build redstone storage or sorting systems on those servers.
How it compares
Shulker Preview is Fabric-only, client-side only, open source under the MIT License, and covers 1.20 – 26.3, so it runs without any server change. Shulkernity is Fabric-only, server-side only, and not open source, with its own license of all rights reserved and files for 1.21 – 26.3.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Stackable Shulkers Fix | Fabric | 1.20.5 – 26.3 | Server-side only | 2026-09-15 |
| Shulker Preview | Fabric | 1.20 – 26.3 | Client-side only | 2026-09-16 |
| Shulkernity | Fabric | 1.21 – 26.3 | Server-side only | 2026-10-11 |
Questions
Does Stackable Shulkers Fix require Carpet?
Does a player need to install this mod?
Which game versions does the mod support?
In the catalog
Stackable Shulkers Fix is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 8,071 mods support Minecraft 26.3.
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Official listing
- Modrinth page
- modrinth.com/mod/stackable-shulkers-fix
- Owner
- KikuGie
- Published
- 2024-06-22
- Updated on Modrinth
- 2026-09-15
- Facts verified
- 2026-10-15