Feature Fill
by LopyLuna
Feature Fill is a NeoForge game mechanics mod that fills gaps in vanilla behavior, mostly by changing how certain mechanics work rather than adding new content.
What it does
The mod keeps close to vanilla and changes mechanics where it fills gaps in features or parity. Its main change is to bucket filling: a conversion fluid such as water no longer consumes a fluid source when placed. A block placed into the same fluid can replace it without the fluid being lost. Both sides need the mod, since it runs as client and server. Feature Fill is open source under the MIT License and has NeoForge files for 1.21.1 – 1.21.10.
Key features
Bucket filling changes
Water and other conversion fluids are not consumed when a bucket fills a target block, so the source is preserved.
Fluid replacement
Placing a block into the same fluid it sits in replaces that fluid, so blocks can be set in place of fluid tiles.
Armor stand and command additions
More blocks can be waterlogged, armor stands gain arms and a shift option, and commands for camera and shake effects are added.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
JustPump is an open source NeoForge mod for 1.21.1 under the MIT License, and it runs on client and server. Create: Liquid Blueprints is also open source, under the GNU General Public License v3.0 only, for 1.21.1 on NeoForge with client and server sides. Create: Made Easy is under the MIT License for 1.21.1 on NeoForge with client and server sides.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Feature Fill | NeoForge | 1.21.1 – 1.21.10 | Client and server | 2025-12-15 |
| JustPump | NeoForge | 1.21.1 | Client and server | 2026-03-02 |
| Create: Liquid Blueprints | NeoForge | 1.21.1 | Client and server | 2026-08-14 |
| Create: Made Easy | NeoForge | 1.21.1 | Client and server | 2026-05-19 |
Questions
Does Feature Fill need to be installed on both sides?
In the catalog
Feature Fill is one of 29,952 Game mechanics mods on ModsFinder, and one of 12,140 Game mechanics mods for NeoForge. 15,569 mods support Minecraft 1.21.10.
More from LopyLuna
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What the author says
A Mod that generally keeps it close to vanilla & mainly changes mechanics Changes Better Bucket Filling Conversion Fluids "Like Water" doesn't consume the fluid if >= 2 same fluid next target block" Avoid Placing blocks in fluids that gets replaced by said fluids More blocks can be waterlogged now Armor Stand now…
Official listing
- Modrinth page
- modrinth.com/mod/feature-fill
- Owner
- LopyLuna
- Published
- 2025-12-11
- Updated on Modrinth
- 2025-12-15
- Facts verified
- 2026-10-15