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Line Width
These settings define how wide each extruded line of filament will be.
Line width can be configured in two ways:
- Fixed value in millimeters (mm)
- Percentage of the nozzle diameter
Tip
Using percentages allows the slicer to automatically adjust the line width when the nozzle size changes, helping maintain consistent print quality across different nozzle sizes.
A good starting point is setting the line width to 100% of the nozzle diameter. Values below this may lead to poor adhesion, while values above 150% can cause over-extrusion, resulting in blobs or poor surface quality.
However, slightly wider lines generally improve layer bonding and print strength, especially for internal features like walls and infill.
Note
100% line width will extrude slightly narrower than the nozzle, but once squished onto the layer below, it flattens to match the nozzle size.
You can read more on the flow math here: Flow Math.
Important
This will match only if using the Classic wall generator.
Arachne will adjust the line width dynamically based on the model's geometry, using this values as a reference.
Line Types
In OrcaSlicer, you can assign different line widths to specific parts of the print. Each type can be customized:
Default
Fallback value used when a specific line width is not set (set to 0).
First Layer
A wider first layer (with a higher first layer height) improves bed adhesion and compensates for uneven build surfaces.
Outer Wall
Controls dimensional accuracy and surface finish.
Recommended: 105%–120% of the nozzle diameter for clean overhangs and detail.
Inner Wall
Can be set wider than the outer wall to enhance structural strength.
Typical value: ≥120%.
Top Surface
Affects the quality of visible top layers.
Recommended: 100%–105% for smooth results without over-extrusion.
Sparse Infill
Recommended to use a conservative value, typically around 115% to improve layer adhesion without getting near volumetric flow limitations.
If you need stronger infill, it's recommended to use infill line multiplier when possible.
Internal Solid Infill
Used for solid top/bottom layers or 100% infill.
Recommended: ~110% for good layer adhesion and visual quality.
Support
Typically set to 100% to balance material usage and functionality. Reducing it too much can lead to weak support structures that may not hold up during printing or break easily during removal leaving debris on the model.