> For the complete documentation index, see [llms.txt](https://tempdocs.zerog.one/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tempdocs.zerog.one/projects/mercury-one.1/build-instruction/phase-1/concepts.md).

# Concepts

## <mark style="color:red;">Printed part codes</mark>

Our parts have printed codes to aid assembly.

1. A part code identifies
   1. If the part belongs on the **left (‘L’)** or **right (‘R’)** side of the printer.
   2. The **version** of the part.

<figure><img src="/files/DBnAIdBPfMjYEAmm36Z4" alt=""><figcaption></figcaption></figure>

## <mark style="color:red;">Flange Stacks</mark>

Flange stacks (along with 5x30mm dowel pins) are used to create smooth idlers.

{% hint style="info" %}
Quality idlers, smooth and toothed, are key for your printer's performance. We use flange stacks throughout assembly.
{% endhint %}

Single flange stacks use

* [**three (3)** shims](#user-content-fn-1)[^1] and [**two (2)** bearings](#user-content-fn-2)[^2].

Double stacks uses

* [**five (5**) shims](#user-content-fn-1)[^1] and [**four (4)** bearings](#user-content-fn-2)[^2].

<figure><img src="/files/1LCfxslmTdQl4TivKXcm" alt=""><figcaption></figcaption></figure>

## <mark style="color:red;">Types of Idlers</mark>

### <mark style="color:red;">Smooth Idlers</mark>

[Smooth idlers](#user-content-fn-3)[^3] are the most common idler that we will use; they turn the belt around its smooth side.

A **single flange stack** has **one (1)** smooth idler; a **double flange stack** has **two (2)**.

<figure><img src="/files/sPdSrS1oDZP14duiQVXA" alt=""><figcaption></figcaption></figure>

### <mark style="color:red;">Toothed Idlers</mark>

**Toothed idlers** are used on the **X joints only**. These are used when the belt turns towards its toothed side.

<figure><img src="/files/CXFyj3QJcHLLB5FXbFuR" alt="" width="375"><figcaption></figcaption></figure>

[^1]: M5X1MM

[^2]: F695 BEARING

[^3]: Revering to one step up, this is our definition of Smooth Idlers.


---

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