Stack Size Control

Early access. This is an early version: expect bugs and balance changes. Please report problems on the mod
page (Discussion tab) with the Factorio log (%APPDATA%\Factorio\factorio-current.log).

Change item stack sizes in Factorio 2.1 from the startup settings. Works with items from other mods.

Features

Global multiplier for every item (×0.01 to ×1000).
Multipliers per category: ores and raw materials, intermediate products, buildings (logistics, production,
space), combat, everything else.
Largest stack size cap.
Exact values for single items, e.g. iron-plate=1000, wood=500, transport-belt=400 (they win over the
multipliers).
Items with stack size 1 (vehicles, trains, spidertron, platform starter packs) are left alone unless you turn
that on. Armor, blueprints, blueprint books and selection tools are never changed.

How to use

Main menu → Settings → Mod settings → Startup.
Set the multipliers. Result = original stack × global × category multiplier, rounded, at least 1, at most the cap.
For exact values fill Exact values for items with internal-name=count pairs separated by commas. Internal
names show in item tooltips after F4 → show-debug-info-in-tooltips.
Confirm: the game restarts and loads with the new stack sizes. The log (factorio-current.log) lists how many
items changed and any name it could not find.

Notes

Startup settings are the same for everyone in a multiplayer game (the server's values are used).
Making stacks smaller in an existing save does not delete items: oversized stacks stay until you move them.

Recommended mods (same author)

Military Support: military economy, 3x3 military drills, loaders, big storage tanks, hyper belts/beacon/modules, military crates, pipes, power grid.
Military Trucks: trucks with stops and schedules on military roads; fuel stations, fluid stations and tankers, parking lots.
SU-100: SU-100 self-propelled gun with its own shells.
T-90: T-90 main battle tank, turret turns all round, 125 mm gun, BPS and OFS / OFZ shells, own sounds.
Smerch MLRS: BM-30 Smerch multiple rocket launcher, 400-tile salvos, fire-control radar network.
Character Control: inventory size, mining, crafting and running speed, pickup / build / reach distance from a panel next to the inventory.

Requirements

Factorio 2.1. Space Age is not needed; items of Space Age and other mods are covered too.

Install / uninstall

Install from the in-game mod portal or drop the zip into %APPDATA%\Factorio\mods. Removing the mod puts the
stack sizes back to the defaults.

Languages

English, Russian, German, French, Spanish, Brazilian Portuguese, Italian, Polish, Ukrainian, Chinese (simplified),
Japanese, Korean. The non-English/Russian translations were machine-assisted; corrections are welcome.

Credits and AI disclosure

Code and art were made by the author together with an AI coding agent: Claude Code (Anthropic, Claude Opus 5.5).

License

MIT (see LICENSE).