# ARC-Forge Upgrades

**ARC-Forge Upgrades** are used to improve the performance of your ARCs and the output and value of **Alloy Parts**.

When these **Upgrades** are built, a random “builds” limit will be assigned to them (except for **Xtended Upgrades**), which indicates the number of builds that the **Upgrade** can be applied to before being used up.

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The acronym for these Upgrades is **STEP**-**X**:

**S**tability, **T**ech, **E**nhance, **P**recision, **X**tended
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* **S**tability - Improves chance of generating higher rarity parts while decreasing chance of building lower rarity parts.
* **T**ech - Reduces [**Build Time**](https://alloy-space.gitbook.io/alloy-space/alloy-fabrication/the-build#print-time) by 10% of the initial build time.
* **E**nhance - Increases [**Purity Range**](https://alloy-space.gitbook.io/alloy-space/nft-parts/part-purity) of an ARC-Forge. The low end is increased by 2 and the high end is increased by 2.
* **P**recision - Increases **First Stage Success Rate** by 1%, which has a trickle-up effect for each [**Evaluation Stage**](https://alloy-space.gitbook.io/alloy-space/alloy-fabrication/the-build#evaluation-stages).
* **X**tended - Eliminates catastrophic malfunctions for 14 days.

> *FUN FACT: A **STEP** file is a 3D model file format and X refers to a 3D axis.* :smile:

### Stacking Upgrades

**ARC-Forge Upgrades** have different stack limits, meaning **more than 1 Upgrade of the same type** can be equipped to an ARC-Forge at once.
