Abiotic Factor Server: Increase Item Stack Sizes

Updated 4 November 2026 · Standard formula, shown below

This guide explains how to increase the maximum stack size for items on your Abiotic Factor dedicated server. By default, most items stack to a set limit, which can be tedious when managing large inventories. You’ll edit the server’s configuration file to change the stack size for all items globally. You’ll need access to the server’s file system, either locally or via FTP/SFTP, and the server must be stopped while editing.

What You’ll Need

Access to the server’s file system (local or FTP/SFTP credentials).
A text editor (Notepad++, VS Code, or even Notepad on Windows).
Ability to stop and restart the server.

Step-by-Step

Stop the server. Ensure the Abiotic Factor server is completely shut down before editing any files. This prevents the server from overwriting your changes or crashing due to a mid-write read.
Locate the configuration file. Navigate to the server’s root folder. The main configuration file is named Game.ini and is typically found inside the Saved/Config/LinuxServer/ (or WindowsServer) folder. The full path is usually: AbioticFactor/Saved/Config/LinuxServer/Game.ini.
Open Game.ini in a text editor. If the file doesn’t exist, create it in that folder.
Add or modify the [/Script/AbioticFactor.AbioticInventorySettings] section. Scroll to the bottom of the file. If you see a section header like [/Script/AbioticFactor.AbioticInventorySettings], add the setting below it. If not, add the entire section at the end of the file.
Add the MaxStackSizeMultiplier line. Under that section, add the following line:
```
MaxStackSizeMultiplier=10
```
Replace 10 with the multiplier you want. For example, a value of 2 doubles the stack size (e.g., 20 items instead of 10), and 10 makes stacks ten times larger (100 items instead of 10). The game multiplies the default stack size by this number.
Save the file. Ensure you save it as Game.ini with the same encoding (UTF-8) and no extra extensions.
Restart the server. Start the server again. The new stack sizes will apply to all items that use the default stacking system.
Verify the change. Join the server, pick up an item, and check its max stack size in the inventory tooltip. It should reflect the new multiplier.

Common Mistakes

Editing while the server is running. The server may overwrite the file on shutdown, losing your changes.
Wrong section header. Adding the setting under a different section (e.g., [/Script/Engine.GameSession]) will have no effect. The header must be exactly [/Script/AbioticFactor.AbioticInventorySettings].
Using a decimal or negative number. The multiplier must be a positive whole number. Values like 1.5 or -2 may be ignored or cause errors.
Forgetting to save the file as Game.ini. Some editors may add a .txt extension if you don’t set the file type to “All Files”.
Placing the setting in the wrong file. Some guides mention Engine.ini or ServerSettings.ini; this setting belongs in Game.ini.

Tips

Start with a moderate multiplier. A multiplier of 5 or 10 is usually enough to reduce inventory management without making the game too easy or causing UI issues.
Back up the original file. Copy Game.ini before editing so you can revert if something goes wrong.
Use a consistent multiplier. The setting applies to all items, so you don’t need to configure each item individually.
Test with a single item. After restarting, pick up a common item like a rock or a piece of scrap to verify the stack size before relying on it.
Check server logs. If the setting doesn’t apply, check the server log for any errors related to Game.ini or the inventory settings.

Troubleshooting

Stack sizes unchanged. Double-check the section header and the exact spelling of MaxStackSizeMultiplier. Ensure the file is saved in the correct location and the server was fully stopped before editing.
Server fails to start. If the server crashes or won’t boot, you likely have a syntax error in the Game.ini. Remove the added lines and start the server to confirm it’s the cause, then re-add them carefully.
Only some items have larger stacks. Some items (like ammo or certain quest items) may have a hard-coded stack size that ignores the multiplier. This is not a bug; it’s by design for balance.
Setting resets after server update. Game updates may reset or overwrite configuration files. Re-apply the setting after major updates.
Multiplier seems to be ignored. Try using a very high value like 100 to see if it changes anything. If not, the file may be read-only or the server is using a different config path (e.g., a custom launch argument).

Frequently Asked Questions

Does this work for dedicated servers only?

Yes, this method is for dedicated servers. For a single-player world, you’d need to modify the local save’s Game.ini, but that’s not recommended as it can cause issues.

Will this affect existing item stacks in the world?

No, existing stacks will remain as they are. The multiplier only applies to newly picked up items or items that are re-stacked after the change.

Can I set different stack sizes for different items?

Not with this setting. It applies a global multiplier. To customize per-item, you’d need a mod or plugin that supports item-specific overrides.

Is there a maximum safe multiplier?

There’s no official limit, but extremely high values (e.g., 1000) may cause UI glitches or make inventory management trivial. A multiplier of 10-50 is generally safe.

Do I need to restart the server for the change to take effect?

Yes, the server reads the config at startup. A restart is required.

What if I don’t have a `Game.ini` file?

Create one in the correct folder. The server will read it on the next start. Ensure the folder structure matches the default (e.g., Saved/Config/LinuxServer/).

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.