Understanding Prusa Slicer Extrusion Width

Prusa Slicer Extrusion Width Unexpected Behaviour PrusaSlicer
Prusa Slicer Extrusion Width Unexpected Behaviour PrusaSlicer from forum.prusa3d.com


Prusa Slicer is a popular slicing software used by 3D printing enthusiasts. It allows users to prepare their 3D models for printing by converting them into a format that the printer can understand. One important setting in Prusa Slicer is the extrusion width, which determines the amount of material that is deposited by the printer during each pass. In this article, we will explore the concept of extrusion width and its impact on print quality.

What is Extrusion Width?

Extrusion width refers to the diameter of the filament that is being extruded by the 3D printer. It determines the thickness of each printed layer. Prusa Slicer allows users to adjust the extrusion width to achieve the desired print quality. The default extrusion width setting is usually determined by the printer’s specifications, but it can be customized according to the user’s preferences.

Factors Affecting Extrusion Width

There are several factors that can affect the extrusion width in Prusa Slicer. These include the nozzle size, layer height, print speed, and filament diameter. Each of these factors plays a role in determining the optimal extrusion width for a specific print. It is important to understand how these factors interact with each other to achieve the desired results.

Why is Extrusion Width Important?

Extrusion width plays a crucial role in determining the overall print quality. If the extrusion width is too narrow, the printed layers may not bond properly, resulting in a weak and fragile print. On the other hand, if the extrusion width is too wide, the printed layers may overlap, leading to a loss of detail and accuracy. Finding the right balance is essential for achieving high-quality prints.

Impact on Print Speed

The extrusion width also has an impact on print speed. A narrower extrusion width requires more passes to cover the same area, resulting in longer print times. Conversely, a wider extrusion width allows for faster printing but may sacrifice some detail. It is important to strike a balance between print speed and print quality when adjusting the extrusion width.

How to Adjust Extrusion Width in Prusa Slicer

Adjusting the extrusion width in Prusa Slicer is a straightforward process. Simply navigate to the “Filament Settings” tab and look for the “Extrusion Width” option. Here, you can manually enter the desired extrusion width value or choose from a list of predefined values. It is recommended to start with the default value and make incremental adjustments based on the desired print quality.

Experimenting with Extrusion Width

It is always a good idea to experiment with different extrusion width settings to find the optimal value for your specific printer and filament. Start by printing a calibration object, such as a simple cube, and gradually adjust the extrusion width until you achieve the desired print quality. Keep in mind that the optimal extrusion width may vary depending on the specific model being printed.


Understanding and adjusting the extrusion width in Prusa Slicer is crucial for achieving high-quality 3D prints. By finding the right balance between print speed and print quality, users can optimize their printing process and produce accurate and detailed models. Experimentation and calibration are key in finding the optimal extrusion width for each individual printer and filament combination. With the right settings, users can unlock the full potential of their 3D printers and create impressive prints.