# 3D-Printing Components

## Printing and Preparing Your 3D-PAWS Components

Building a 3D-Printed Automatic Weather Station (3D-PAWS) requires more than simply printing parts and snapping them together. Because printers, filament brands, and environmental conditions vary, careful material selection and proper post-processing are essential for a successful build.

This page outlines best practices for filament selection and part preparation before assembly.

### **Downloading the 3D-PAWS Print Files**

All official 3D printable components for the 3D-PAWS are available in the public GitHub repository:

{% embed url="<https://github.com/3d-paws/3D-PAWS-Print-Files>" %}

The repository contains organized STL files for each instrument and subsystem of the station. Files are grouped by component (e.g., rain gauge, wind sensors, radiation shield) to simplify printing and part management.

Before printing:

* Download the latest version of the repository.
* Review the folder structure to identify required parts.
* Confirm your printer meets the recommended build volume (minimum 200 mm × 200 mm × 200 mm).
* Verify scale and slicing settings before starting large prints.

Design updates are periodically released, so check the repository before beginning a new build to ensure you are using the most current files.

### Understanding Print Files

The 3D-PAWS print files are organized by component and follow a consistent naming convention. However, file names may not always be immediately intuitive on their own.

To identify the correct parts:

* Refer to the **parts list at the beginning of the relevant manual section**
* Match file names to the listed components
* Use diagrams in the manual to confirm part placement
* Preview the **.stl files in each folder** to see what parts look like before printing (files are shown without supports)

Using the manual alongside the print files will make it much easier to navigate the repository and ensure the correct components are printed.

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### Choosing the Right Filament

Since the 3D-PAWS is designed for continuous outdoor use, UV resistance is critical.

#### Use ASA for Outdoor Components

We strongly recommend ASA (Acrylonitrile Styrene Acrylate) for most components, especially those exposed to sunlight. ASA provides:

* Excellent UV resistance
* Good mechanical strength
* Temperature stability
* Long-term outdoor durability

For radiation shield components, use **white, opaque ASA** to maximize solar reflectivity and minimize heating of the sensors.

**Recommended white ASA brands:**

* Polymaker
* Overture

Approximately **2 kg of filament** is required per station.

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### Keep Filament Dry

Humidity and filament do not mix.

ASA and ABS readily absorb moisture from the air, which can cause:

* Poor layer adhesion
* Surface defects
* Stringing
* Reduced mechanical strength

Store filament in a sealed container with desiccant and keep it dry prior to printing. If filament has been exposed to humidity for an extended period, dry it before use according to the manufacturer’s recommendations.

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### Recommended Print Settings

#### Use the Provided .3mf Files

Whenever possible, use the provided **.3mf project files**. These files contain pre-configured print settings, including orientation and support placement, that have been tested for successful builds.

If using STL files instead, ensure that part orientation and support settings match the intended configuration.

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#### Infill: 99% Recommended

For structural components, we recommend printing at **99% infill**.

High infill:

* Increases mechanical strength
* Improves durability in outdoor environments
* Enhances resistance to wind and mechanical stress
* Reduces internal moisture pathways

Lower infill settings may compromise structural integrity, particularly for wind-exposed components.

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#### Supports and Cantilevered Features

Several parts include overhangs or hanging cantilevers that require supports.

When printing:

* Ensure supports are enabled where required
* Verify support placement before starting the print
* Avoid removing supports too aggressively during cleanup

The .3mf files include recommended support configurations. If generating supports manually, confirm that overhangs and cantilevered sections are adequately supported to prevent sagging or dimensional inaccuracies.

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### After Printing: Clean and Prepare Parts

3D printed parts require light finishing before assembly. Taking time here will make the build process much smoother.

{% hint style="info" %}

### Safety Notice

When cleaning and preparing 3D printed components, appropriate safety precautions should be followed.

* Wear **safety glasses or eye protection** to prevent injury from small plastic fragments or support material that may detach during removal.
* Use **protective gloves** when handling parts and tools.
* Be aware that tools such as cutters, knives, and pliers have **sharp edges** and can cause injury if not handled properly.
* Remove supports slowly and in a controlled manner to minimize the risk of parts snapping or debris becoming airborne.

Failure to follow proper safety practices may result in injury during part preparation.
{% endhint %}

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#### Remove Supports Carefully

Some components include complex support structures.

* Remove supports slowly and carefully.
* Avoid twisting aggressively to prevent cracking.
* Use picks, flush cutters, or pliers where appropriate.
* Ensure all support material has been removed from internal cavities and mating surfaces.

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#### Remove Burrs and Surface Imperfections

Most parts will have small nubs, seams, or minor blemishes from the printing process.

Before assembly:

* Lightly file all mating surfaces.
* Remove small plastic nubs and stringing.
* Clean push-fit and sealing surfaces thoroughly.

The 3D-PAWS design uses tight push-fit tolerances. Even small imperfections can prevent parts from seating properly.

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#### Lightly Sand and Work Threaded Parts

Printed threads are functional but often tight at first.

* Lightly sand threads if necessary.
* Remove loose debris.
* Thread components together slowly.
* Back them out and repeat several times.

This process smooths minor imperfections and prevents cross-threading. Never force threaded parts together.

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#### Dry Fit Before Final Assembly

Before gluing or permanently installing components:

* Test-fit all parts.
* Confirm alignment.
* Ensure push-fit connections fully seat.

If something does not fit, inspect for leftover support material or minor surface defects before modifying the part.

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### Take Your Time

3D printing is both technical and practical. Small finishing steps — cleaning, sanding, working threads, and verifying print settings — greatly improve assembly success and long-term durability in the field.

Careful preparation now will result in a smoother build and a more reliable station outdoors.

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## Related Resources

* [3D-Printer Maintenance](https://3dpaws.comet.ucar.edu/other-3d-paws-resources/3d-printer-maintenance)