Modrinth · Minecraft mod

Gravity Duplication Return

Brings back the classic end portal gravity block duplication mechanics for technical Minecraft players.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which Gravity Duplication Return release matches 26.2?

Updated 15 days ago

Best match for your filters 1.0.0

Game version 26.1, 26.1.1, 26.1.2

Loader Fabric

Gravity Duplication Return 1.0.0 targets 26.1, 26.1.1, 26.1.2 with Fabric. Do not install it on the client. It must be installed on the dedicated server. All 1 required mods have matching files.

Where it goes

Is Gravity Duplication Return required on the client, server, or both?

Do not install it on the client. It must be installed on the dedicated server.

Client Not supported

Dedicated server Required

Loader for this release Fabric

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

This file is marked server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does Gravity Duplication Return 1.0.0 need?

1.0.0 on 26.2. Every mod below is checked against that same setup.

All 1 required mods have matching files

Install Fabric API first. We found matching files for this game-version and loader setup.

Fabric API Needed by Gravity Duplication Return 1.0.0

required

Matching file found Matched file: 0.156.0+26.2

We only count dependency files that match this setup. A file for another loader does not fill the gap.

Before you install it

Add Gravity Duplication Return without breaking your instance.

Built for Gravity Duplication Return 1.0.0 on 26.2. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use 1.0.0. It targets 26.1, 26.1.1, 26.1.2 with Fabric; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

Install Fabric API first. We found matching files for this game-version and loader setup.
03
Put it on the correct side

Do not install it on the client. It must be installed on the dedicated server.
04
Pick the file you checked

Use the “Get this file” button beside 1.0.0. It opens that exact file at the source.

About this project

What does Gravity Duplication Return add?

Features

Bring back the classic falling block duplication mechanics to modern Minecraft versions!

Gravity Duplication Return is a lightweight, server-side Fabric mod that restores the legendary End Portal duplication bug. This mechanic, once a staple of technical Minecraft, allowed players to duplicate falling blocks like Sand, Gravel, and Concrete Powder. This mod brings it back exactly as you remember it, while adding modern controls for server administrators.

Portal Duplication

Reverts the "fix" for entities passing through portals. When a falling block entity (like sand or a dragon egg) enters an End Portal, it is no longer removed from the source world during the dimension change. This results in the entity being successfully teleported while also remaining in the original world, enabling classic "duper" machines to function again.

Administrative Control

We understand that server owners might want to regulate duplication. We've added two specific GameRules to give you full control:

/gamerule enable_portal_duplication <true|false>
- Default: true
- Effect: Globally toggles the duplication mechanic for all allowed entities.
/gamerule enable_dragon_egg_duplication <true|false>
- Default: true
- Effect: Specifically toggles duplication for Dragon Eggs. Useful for servers that want to allow sand duping but keep the Dragon Egg unique.

Detailed Logging

Stay informed about what's happening on your server. Every time an entity is duplicated, a log entry is created in the server console: [GravityDupe] Sand duplicated at End Portal at [x=100, y=64, z=200]

Mod Compatibility & Customization

Designed with compatibility in mind, this mod uses Minecraft's Tag system.

Custom Entities: By default, it supports minecraft:falling_block.
Expandable: You can allow any entity (even items or entities from other mods) to be duplicated by adding them to the entity type tag: gravity-duplication-return:duplicatable_entities via a Data Pack.

Optimized Performance

The mod uses a "Fast-Path" check for standard falling blocks to ensure zero impact on server tick rates, even with high-speed duplication machines.

Platform: Fabric
Minecraft Versions: 26.1, 26.1.1, 26.1.2, 26.2
Side: Server-Side Only. Clients do not need to install this mod to benefit from the restored mechanics.

Ensure you have the Fabric Loader installed on your server or client.
Download the Gravity Duplication Return JAR file.
Place the file into your server's or singleplayer instance's mods folder.
Restart your server / game and enjoy!

This project is licensed under the CC-BY-4.0 license. If you want to read the full legal details, click the button below:

Project description from Modrinth.

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