3D Print Line Width Calculator

Calculate optimal extrusion line widths for perimeters, infill, and solid top layers. Improves layer squish, surface finish, and part strength.

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How to Use Line Width Calculator

  1. Enter your nozzle diameter (e.g. 0.4mm).
  2. Specify layer height and target application (Standard, First Layer Adhesion, Overhangs, or Max Strength).
  3. View calculated ideal extrusion line widths (typically 110% to 125% of nozzle diameter).

What is the Line Width Calculator?

A slicer calibration tool that calculates optimal extrusion bead geometries to maximize inter-line cohesion.

Formula Used

• Recommended Default Line Width = Nozzle Diameter × 1.125 • First Layer Line Width = Nozzle Diameter × 1.20 • Top Solid Surface Line Width = Nozzle Diameter × 1.00

Real-World Example

For a 0.40mm nozzle: • Default Perimeters = 0.40 × 1.125 = 0.45mm • First Layer Squish = 0.40 × 1.20 = 0.48mm • Top Surface Detail = 0.40 × 1.00 = 0.40mm.

Accuracy and Limitations

Extruder calibration (E-steps and flow ratio) must be calibrated for accurate physical widths.

Who It Is For

Slicer tuners seeking water-tight prints and glass-smooth top surfaces.

Frequently Asked Questions

Why should line width be larger than nozzle diameter?
Setting line width slightly larger than nozzle diameter (e.g., 0.45mm–0.48mm on a 0.4mm nozzle) creates a slight back-pressure that squishes molten plastic into previous layers, eliminating micro-gaps.