AutoSlabs (Unofficial Port)

An unofficial Fabric port of AutoSlabs for Minecraft 1.21.1. It adds vertical placement states to vanilla and modded slab blocks without registering new block or item IDs.

Features

• Place slabs vertically in north/south/east/west orientations.
• Hold a slab and press K to cycle placement modes; Sneak + K cycles backwards. The default mode preserves AutoSlabs placement, while Vanilla Placement returns to normal placement rules.
• KleeSlabs: mine one half of a double slab; hold Sneak while mining to break both halves.
• Includes the optional built-in Distinct Slabs resource pack.

Requirements

• Minecraft 1.21.1
• Fabric Loader 0.16.5 or newer, and Fabric API
• Better Runtime Resource Pack (BRRP) 1.21.1 is a required dependency for generated blockstates and models. BRRP is separate and is not bundled in this file.
• Mod Menu is optional.

Attribution and license

This unofficial port is based on AutoSlabs by Andrew6rant. The original source is MIT-licensed and its license notice is retained. This port is not endorsed by the original author. BRRP is maintained separately by SolidBlock and is licensed under MPL-2.0.

AI disclosure: AI assistance was used to adapt the code for Minecraft 1.21.1. The project icon was created specifically for this port; no AI-generated showcase images are used.