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RXB-KitMinecraft mod for 1.21.1

Lightweight 16x16 building mod. Also nuclear power!

client and servernewest supported release 1.21.1TechnologyUtilityDecoration
Latest version
1.3.1
Minecraft
1.19.2 to 1.21.1
Java
Java 21+
Loaders
Forge, NeoForge
Licence
LicenseRef-All-Rights-Reserved
Downloads
2.6k
Updated
1 mo ago
Available on
Modrinth
Space NodeOur hosting

Host RXB-Kit servers

One click and RXB-Kit is installed with the right loader, on hardware built for it.

  • 1.21.1
  • Forge
  • NeoForge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version RXB-Kit declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Forge, NeoForge21+declared8 Aug 2024
1.20.1Forge, NeoForge17+declared12 Jun 2023
1.19.4Forge, NeoForge17+declared14 Mar 2023
1.19.2Forge, NeoForge17+declared5 Aug 2022

Download

From RXB-Kit’s own host. Nothing is re-hosted here.

Most recently published release

1.3.1release31 Jul 2025

rxbkit-1.3.1-neoforge-1.21.1.jar · 0.7 MB · for 1.21.1 · NeoForge

Download this release
558290529aed…
Older versions7
  • 1.3.0b28 Jul 20251.21.10.7 MB43 downloadsae2ce89c9059…Get
  • 1.2.010 Jul 20251.21.13.4 MB733 downloadsaff030a76f54…Get
  • 1.1.023 Dec 20231.20.11.3 MB300 downloads1c28e90e67d3…Choose file on publisher ↗
  • 1.0.27 Sept 20231.19.41.2 MB146 downloads358b2f5636b5…Get
  • 1.0.1b20 Jun 20231.19.41.1 MB163 downloadsc65c3fea5aca…Get
  • 1.0.116 Jun 20231.19.41.1 MB118 downloads78f32d5d00b6…Get
  • 1.0.07 May 20231.19.20.5 MB242 downloadse9166f3fc448…Get

Frequently asked

Does RXB-Kit work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version RXB-Kit declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does RXB-Kit support?

Everything the author has declared, from 1.19.2 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install RXB-Kit on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does RXB-Kit support?

Forge, NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for RXB-Kit?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What licence is RXB-Kit under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install RXB-Kit?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download RXB-Kit safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from Modrinth, where the author last updated it on 1 Sept 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .