ModsFinder

Upcycle! (Compost Rotten Flesh!)

by XxRexRaptorxX

Upcycle! lets players compost rotten flesh, spider eyes and other leftover items into bone meal inside a composter, instead of throwing them away.

ForgeNeoForgeServer-side onlyAll rights reserved1.18 – 1.21.10

What it does

The mod targets trash items that vanilla Minecraft discards: rotten flesh, spider eyes, fermented spider eyes, poisonous potatoes, rabbit's feet, turtle eggs, sniffer eggs and sculk veins can all be fed to a composter. Once composted, they add to the composter level like other organic items and let players collect bone meal from the result.

Upcycle! is a lightweight addition to vanilla gameplay, so it changes little beyond the composting behavior. It is server-side only, which means players join without installing it. It requires Magma Core on both Forge and NeoForge, and files are published for 1.18 – 1.21.10 on Forge and NeoForge.

Key features

  1. Composting rotten flesh

    Rotten flesh goes into a composter and raises its level, so it no longer has to be discarded.

  2. Spider and sculk items

    Spider eyes, fermented spider eyes and sculk veins are accepted by the composter alongside rotten flesh.

  3. Rare drops as compost

    Turtle eggs, sniffer eggs and rabbit's feet can be composted, turning rare drops into bone meal.

  4. Bone meal output

    Filled composters yield bone meal, which players use for growing crops and plants as usual.

Compatibility

Latest build for each game version and loader.

1.21.x8 of 8 versions with builds
1.21.10Not availablev.3.1.0
1.21.9Not availablev.3.1.0
1.21.5Not availablev.3.0.0
1.21.4Not availablev.2.1.1
1.21.3Not availablev.2.1.1
1.21.2Not availablev.2.1.1
1.21.1Not availablev.2.0.0
1.21Not availablev.2.0.0
1.20.x5 of 5 versions with builds
1.20.4v.1.1.0v.1.2.1
1.20.3v.1.1.0v.1.2.1
1.20.2v.1.1.0v.1.2.1
1.20.1v.1.1.0Not available
1.20v.1.1.0Not available
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Magma CoreThis core mod contains basic code and features like update checker and much more that my other mods access
Required

Use cases

Clearing mob drops

Players who farm zombies and spiders can dispose of the surplus flesh and eyes as compost rather than storing them.

Who it’s for: Players who want more use for mob drops and leftover items, on single-player worlds or multiplayer servers where the server owner installs the mod.

How it compares

Full comparison

Rotten Flesh Leather converts rotten flesh into leather rather than composting it. It works on either side, and neither needs it, under the BSD 2-Clause License, for 1.20.5 – 1.21.4. Rotten Flesh to Leather covers Fabric, Forge, NeoForge and Quilt for 1.19 – 26.3 under the MIT License, and only the server needs it while players may leave it out. YARFTL is a Forge-only leather mod for 1.20.1 that needs to be on both the client and the server, under All rights reserved, and it is not open source.

ModLoadersGame versionsEnvironmentUpdated
Upcycle! (Compost Rotten Flesh!)Forge and NeoForge1.18 – 1.21.10Server-side only2025-10-08
Rotten Flesh LeatherFabric, Forge, NeoForge and Quilt1.20.5 – 1.21.4Server required, client optional2025-01-27
Rotten Flesh to LeatherFabric, Forge, NeoForge and Quilt1.19 – 26.3Server required, client optional2026-09-19
YARFTL (Yet Another Rotten Flesh To Leather Mod)Forge1.20.1Client and server2026-05-08

Questions

Does Upcycle! need Magma Core?

Yes. Magma Core is a required dependency and must be installed next to Upcycle! on Forge or NeoForge.

Does Upcycle! have to be installed on the client?

No. Only the server needs it, and players join without installing anything.

Which game versions does Upcycle! support?

Forge and NeoForge files cover 1.18 – 1.21.10, and the latest NeoForge file is v.3.1.0 for 1.21.10, published on 2025-10-08.

In the catalog

Upcycle! (Compost Rotten Flesh!) is one of 29,952 Game mechanics mods on ModsFinder, and one of 13,316 Game mechanics mods for Forge. 15,569 mods support Minecraft 1.21.10.

Game mechanics mods29,952Forge modsMods for 1.21.1015,569

More from XxRexRaptorxX

All projects
Additional Structures1.12 – 1.21.11MineTraps1.12 – 1.21.10Age of Weapons - Reforged1.12.2 – 1.20.4City Craft1.19 – 1.21.1All The Compatibility1.17 – 1.21.1Lexicon1.18 – 1.21.10

Similar mods

Better Third Person1.16.4 – 1.21.8Sounds1.20 – 26.3Cut Through1.18.2 – 26.3Bad Wither No Cookie - Reloaded1.12.2 – 1.21.10Client Tweaks1.12.2 – 26.3Double Doors1.16.5 – 26.3

What the author says

This lightweight vanilla+ mod allows you to upcycle trash like rotten flesh and spider eyes in the composter to bone meal!
XxRexRaptorxX, on the Modrinth page

Official listing

Owner
XxRexRaptorxX
Published
2022-11-17
Updated on Modrinth
2025-10-08
Facts verified
2026-10-15

Tags

Game mechanicsUtility
Open on ModrinthCompare