Nozzle Line Width & Layer Height Calculator
Turn your nozzle diameter into recommended slicer settings: extrusion line width plus safe maximum and minimum layer heights.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter your nozzle diameter (0.4 mm is the most common size).
- Optionally adjust the line-width factor (1.0–1.2) and the maximum-layer factor (up to 0.8) if you want wider lines or thicker draft layers.
- Use the recommended line width and keep your chosen layer height between the minimum and maximum shown.
How it works
Every value scales with the nozzle. Line width = nozzle × line-width factor (default 1.125). Maximum layer height = nozzle × max-layer factor (default 0.75) so layers still squish onto each other. Minimum layer height = nozzle × 0.25, thick enough for reliable flow.
Worked example
Worked example. For a 0.4 mm nozzle with the defaults, the recommended line width is 0.45 mm, the maximum layer height is 0.3 mm and the minimum is 0.1 mm. A 0.6 mm nozzle scales up to 0.675 mm lines, a 0.45 mm maximum layer and a 0.15 mm minimum.
Common mistakes
- Setting the layer height equal to or above the nozzle diameter, which stops layers from bonding to the one below.
- Leaving line width at a fixed 0.4 mm after fitting a larger nozzle — it should scale with the nozzle.
- Using the absolute minimum layer height on tall prints, where it multiplies print time for little visible gain.
Frequently asked questions
Why print lines wider than the nozzle?
A slightly wider line (about 1.1–1.2× the nozzle) presses more plastic against the neighbouring line and the layer below, improving adhesion and strength. Very narrow lines can under-fill and leave gaps.
Can I go above the maximum layer height shown?
You can push to roughly 0.8× the nozzle for fast draft prints, but adhesion, overhang quality and dimensional accuracy suffer. Staying at or below 0.75× is the safe default for reliable results.
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Tip: Enter any known values to calculate the remaining results.
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