Description
An addon for IC2 Classic (Minecraft 1.19.2, Forge): UU-Matter replication recipes have to be researched before you can use them.
In IC2 Classic, UU-Matter recipes are secrets. You either have to look them up on a wiki or turn all secrets on in the config. UU Research turns them into progression: build a research station, spend UU-Matter and energy on an item, and its replication recipe unlocks for the whole world.
How it works
- Craft a UU Research Station (MV machine, 128 EU/t max input, 32 EU/t).
- Click the target slot and pick an item from the list. The list shows only items that have a UU-Matter recipe and are not researched yet. You can also click the slot with the item in hand.
- Put UU-Matter into the input. Like the Rare Earth Extractor, the machine processes it one unit at a time. The bar at the top shows processed / needed UU. Recipes that cost more than a stack, such as elytra (112 UU), just need to be topped up.
- When enough UU has been processed, the machine outputs one craft of the recipe (1 diamond, 16 cobblestone, ...) and the recipe is researched: it appears in JEI and works in the crafting table.
Research is shared by the whole world (all players), and the machine idles on a target that is already researched.
Processed UU-Matter is lost if you change the target, if the item is researched somewhere else, or if the machine is broken, just like in the Rare Earth Extractor.
Features
- UU-Matter recipes are hidden in JEI and cannot be crafted until researched. The crafting grid tells you why a pattern gives nothing.
- Recipes panel in the machine window with every researched recipe.
- Item tooltips:
UU: researched ✓, or with Shift the research cost and time. - Iridium ore is researched like everything else. Emerald (diamond + UU) and shulker shell (shell + UU) are conversions rather than replication, so they stay regular IC2 secrets.
- IC2 upgrades: overclocker, transformer, energy storage, ejectors/pullers, muffler.
- Comparator output: research progress or "working".
- Operator commands (permission level 2):
/uuresearch learn <item>,forget <item>,learnall,reset,list.
Recipe

2x Book, OD Scanner, 2x Advanced Circuit, Advanced Machine Casing, 2x Advanced Alloy, UU-Matter
Configuration
Server config saves/<world>/serverconfig/uuresearch-server.toml (put a copy into defaultconfigs/ to apply it to new worlds):
| Option | Default | Meaning |
|---|---|---|
euPerUU |
10000 | EU per 1 UU of an item's replication cost (research time) |
defaultCostUU |
1 | Cost for items IC2 has no UU cost for |
requireResearchToCraft |
true | Block crafting of UU recipes until researched |
Requirements
- Minecraft 1.19.2, Forge 43+
- IC2 Classic 1.19.2-2.1.3.x. The machine is built on IC2's own machine classes, so other IC2 versions are not supported.
- JEI (optional, recommended)
Links
- Source code and issues: GitHub
- License: MIT






