> For the complete documentation index, see [llms.txt](https://ms-kb.msd.unimelb.edu.au/next-lab/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ms-kb.msd.unimelb.edu.au/next-lab/3d-printing/key-techniques/using-the-makerbot-labs-experimental-extruder.md).

# Using the Makerbot Experimental Extruder

## Experimental Extruder

The **NExT Lab** is home to **two Makerbot Labs Experimental Extruders** which can be used to print using **Custom Materials**. Check out some of its uses [here](https://msd-makerspaces.gitbook.io/next-lab/3d-printing/3d-printing-applications#experimental-extruder).

**Book a consultation with us to discuss using the Experimental Extruders for your projects!**

![Makerbot Labs Experimental Extruder with ColorFabb Filament(Source: Makerbot Labs)](/files/-LYegF7T_OZQrGP5Hx3j)

{% hint style="info" %}
Please note that as this is an experimental product, experimenting is a part of the process and there are different design considerations!
{% endhint %}

## Custom/Specialty Materials

We recommend the use of PLA-based[ ](https://colorfabb.com/materials/specials/special-filaments)materials (diameter 1.75mm) from ColorFabb and FormFutura. These materials contain a filling additive to them such as wood and metals. Some vendors that you can visit are:

1. [X3D](https://www.x3d.com.au/store/category/3506-formfutura)
2. [3D Printer Gear](https://www.3dprintergear.com.au/filaments/colorfabb/specialty/)

![ColorFabb Woodfill.](/files/-MBgeE29NUTPok6LatSE)

Come in and talk with us if you have any questions about other materials. Unfortunately, we are **unable** to process requests using **flexible filaments**. Book a consultation if you would like a more in depth chat.

## Other Capabilities

The **Experimental Extruder** is also capable of printing with a **draft nozzle**. Essentially, a nozzle diameter of 0.8mm or larger is used. This speeds up prints significantly and can produce prints with an interesting texture.

![Figure 2.0 - Using the Draft Nozzle can produce some interesting artefacts ](/files/-LYejW49k9YDsH5xyHPu)

## Design Considerations

### Nozzle Diameter

**Special filaments** such as **ColorFabb** require the use of a **stainless steel** (abrasion-resistant) **nozzle**. This nozzle is slightly larger than usual: **0.6 mm** in diameter compared to **0.4 mm**.

{% hint style="info" %}
Filled filaments contain the filler particles (wood, brass, etc.). These have a tendency to get stuck in 0.4mm nozzles and results in nozzle clogs and jams. 0.6mm diameter nozzles are more suitable here.
{% endhint %}

![Figure 3.1 - Nozzle Diameter](/files/-LYel2pRZHp74w83JboR)

With this in mind, roof and floor thicknesses should be changed to multiples of 0.6 mm (**1.8 mm is ideal**)

### Shells

With many filled PLA material, the bond between the plastic as it is deposited tends to be weaker than pure PLA. As a result, many filled filament prints can be more brittle. For this reason, we recommend printing with the following settings:

| Shells                                                | Infill Density                                  | Overhangs                                                                                        | Support Material                                                                                                                                  |
| ----------------------------------------------------- | ----------------------------------------------- | ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| 3 shells are recommended to create less fragile parts | A minimum infill density of 20% is recommended. | Overhangs should not exceed 50° as filled filaments tend to be less successful in this category. | Where possible, avoid support materials as support structures produced by special materials may be unpredictable (too strong/weak, poor adhesion) |

## Job Processing

When processing jobs using the experimental extruder:

* a **$10.00 flat fee is charged per print**. 
* **8 hour restrictions** are still in place
* Students will **provide their own material**. 
* **We will require some extra material** to test custom settings.

Custom Settings are available for download here:

* [0.8 mm Draft Settings ](https://www.makerbot.com/wp-content/img/labs/enlightenme3_draft_minifill_8mm_nozzle.printmode)
* [0.6 mm Draft Settings](https://www.makerbot.com/wp-content/img/labs/thor3d_draft_6mm_nozzle.printmode)
* [0.6 mm WoodFill Settings](https://www.makerbot.com/wp-content/img/labs/maikagm_woodfill.printmode)
* [0.6 mm CopperFill Settings](https://www.makerbot.com/wp-content/img/labs/colorfabb_copperfill.printmode)
* [0.6 mm BronzeFill Settings](https://www.makerbot.com/wp-content/img/labs/colorfabb_bronzefill.printmode)
* [0.6 mm CorkFill Settings](https://www.makerbot.com/wp-content/img/labs/inspector_number_555_corkfill.printmode)