
BlockMixer
This mod is designed to ease the building process. How it works After you put the block, the mod chooses a random slot from BlockMixer's binded slots and automatically switches your character's selection to it.
About this Mod
BlockMixer • Fabric Mod
Description
This mod is designed to ease the building process.
How it works
After you put the block, the mod chooses a random slot from BlockMixer's binded slots and automatically switches your character's selection to it.
Requirements
Fabric
Fabric API
loth Config API
Mod Menu
Features
- Different mixing modes:
Default: random selection of slots, Non-repeating: slot cannot be repeated twice in a row, Non-repeating [2]: the slot cannot be repeated three times in a row. - Ability to adjust slot ratio:
The slot ratio setting allows you to select the priority slot that BlockMixer will select. Thus, by setting the ratio to 10 for one slot and 1 for the other, the first slot will randomize more often at 10.
How to use
Basic usage
To bind and unbind a slot to BlockMixer click B. The binded slot will be highlighted with a green indicator.
Different mixing modes
To select mixing mode go to mod settings (Mod Menu required).
"Toggle Mod" option
This option is for disable mod without cleaning BlockMixer's binded slots. To toggle mod press "Sneak" button (Shift by default) + "Toggle hotbar slot" button (B by default), Shift+B. All binded slots will be highlighted with a red indicator.

"Slot ratio" option
To increase slot ratio press ] (by default). To decrease slot ratio press [ (by default).

Available Versions
How to Install BlockMixer on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.5).
Install Mod
Open the mod browser in the dashboard and search for "BlockMixer". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.5, 1.20.6, 1.20.5 (+5 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
BlockMixer server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.5). You can switch loaders with one click in the panel.
Is BlockMixer compatible with fabric?
BlockMixer officially supports fabric for Minecraft 1.21.5, 1.20.6, 1.20.5. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with BlockMixer – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if BlockMixer consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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