> ## Documentation Index
> Fetch the complete documentation index at: https://stem-docs.intellectualpoint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Colors and additives

> How pigments, special-effect additives, and filament diameter affect print quality and printer wear.

## More than just color

Filament is not just plain plastic. Manufacturers mix in **pigments, dyes, and additives** that change how a print looks, how it behaves, and even how much it wears down your printer. Understanding these helps you get better results and protect your machine.

## Filament diameter and tolerances

Before additives, know that the **diameter** of the filament itself matters. Your printer's firmware assumes a consistent diameter to calculate exactly how much to extrude.

<CardGroup cols={2}>
  <Card title="1.75 mm" icon="minus">
    The most common desktop size (including your Adventurer 5M). More flexible and easier to spool tightly.
  </Card>

  <Card title="2.85 mm (3 mm)" icon="minus">
    Found on some larger and industrial printers. Stiffer and higher flow.
  </Card>
</CardGroup>

Why diameter consistency matters:

* **Extrusion accuracy:** the printer calculates volume from the diameter, so an inconsistent strand over- or under-extrudes.
* **Clogging vs slipping:** too thick and it jams the nozzle; too thin and the extruder gear slips.
* **Layer adhesion:** uneven diameter means uneven, weaker layers.

<Tip>
  Quality filament lists a tight tolerance like **1.75 mm ± 0.02 mm**. Cheap filament with loose tolerance is a common hidden cause of inconsistent prints. You can spot-check with calipers.
</Tip>

## How color affects printing

Pigments do more than change appearance:

<AccordionGroup>
  <Accordion title="Temperature" icon="thermometer">
    **Dark colors absorb more heat** and may need slightly higher nozzle temperatures than light colors of the same material.
  </Accordion>

  <Accordion title="Surface finish" icon="sparkles">
    **Transparent** filament shows layer lines and gloss. **Matte** hides imperfections. **Metallic and pearlescent** finishes can highlight small flaws.
  </Accordion>

  <Accordion title="Consistency" icon="palette">
    Lower-quality filament can vary in color along the spool. High-end filament stays uniform from start to finish.
  </Accordion>
</AccordionGroup>

## Special-effect additives

Additives create striking effects, but many are **abrasive** and wear out soft brass nozzles quickly.

| Additive type         | Effect                                            | Printer wear           | Notes                                                 |
| --------------------- | ------------------------------------------------- | ---------------------- | ----------------------------------------------------- |
| Glow-in-the-dark      | Phosphorescent powders glow after light           | Abrasive - avoid brass | Rough surface, needs higher temps                     |
| Metal fill            | Bronze or copper powder, metallic look and weight | Abrasive               | Use hardened steel; heavier prints                    |
| Wood fill             | Wood fibers in PLA, wood-like look and smell      | Abrasive               | Clogs easily, print slower                            |
| Carbon fiber fill     | Carbon fibers for stiffness                       | Very abrasive          | Matte, stiff; needs a hardened nozzle                 |
| Silk / PLA silk       | Shiny, smooth sheen                               | Normal                 | Great for decorative prints (like the contest prizes) |
| Flexible (TPU blends) | Softer, elastic                                   | Normal                 | Print slowly                                          |

<Warning>
  **Abrasive filaments destroy brass nozzles.** Glow-in-the-dark, metal-fill, wood-fill, and carbon fiber all grind away soft brass and hurt accuracy. Switch to a **hardened steel or ruby** nozzle before printing them.
</Warning>

## Additives and maintenance

<CardGroup cols={3}>
  <Card title="Adjust settings" icon="sliders-horizontal">
    Filled filaments often need higher temperatures and slower speeds to avoid clogs.
  </Card>

  <Card title="Expect more clogs" icon="triangle-alert">
    Particles in filled filament can block a standard nozzle if settings are not tuned.
  </Card>

  <Card title="Maintain more often" icon="wrench">
    Heavy filled filaments mean more frequent nozzle checks and replacements.
  </Card>
</CardGroup>

## Great choices for your contest print

For the capstone contest, **silk PLA** is a fantastic pick - it prints as easily as normal PLA but looks premium, and it is exactly what the prize spools are.

<Info>
  The contest prize spools are **tri-color co-extrusion silk PLA**. They print at normal PLA temperatures on your stock brass nozzle, but produce eye-catching color-shifting results with no special hardware.
</Info>

<Check>
  You understand how diameter tolerance affects accuracy, how color changes temperature and finish, and why abrasive additives require hardened nozzles. For safe, easy, good-looking prints, stick with standard or silk PLA on your stock nozzle.
</Check>