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Print Speed Calculator

Calculate 3D print speed settings from volumetric flow rate and layer dimensions. Set max speed within extruder and hotend flow limits.

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Inputs that matter
Model Height, Layer Height, Print Speed, Total Extrusion Length
Output to expect
Print Speed Calculator
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Volumetric Flow Rate

Flow rate (mm³/s) is the volume of filament extruded per second. It depends on hotend, nozzle size, temperature, and material. Typical PLA: 10–15 mm³/s on stock hotend.

Flow (mm³/s) = line width (mm) × layer height (mm) × speed (mm/s)

Speed from Flow Limit

Rearrange to find max speed at given flow capacity. Exceeding max flow causes under-extrusion, gaps, and weak layers.

Max speed (mm/s) = max flow (mm³/s) / (line width × layer height)

Line Width Factor

Line width is typically 110–120% of nozzle diameter. A 0.4 mm nozzle often prints at 0.45–0.48 mm line width.

Line width ≈ nozzle diameter × 1.1–1.2

Updated: July 2026

Example Scenarios

0.45 mm line × 0.20 mm layer = 0.09 mm² cross-section. Max speed = 12 / 0.09 ≈ 133 mm/s theoretical — practical limit ~80 mm/s accounting for acceleration.

0.40 mm line × 0.12 mm layer, 8 mm³/s PETG flow: max speed ≈ 167 mm/s but run 40–50 mm/s for quality and cooling time on small features.

0.60 mm line × 0.28 mm layer = 0.168 mm². Max speed = 25 / 0.168 ≈ 149 mm/s — enables fast large-format printing with 0.6 mm nozzle.

Common Mistakes to Avoid

Setting slicer speed to 150 mm/s without checking flow rate

Slicer speed alone is meaningless without layer height and line width. Calculate actual mm³/s — a 0.4 mm nozzle at 0.2 mm layers rarely sustains above 12 mm³/s on stock hardware.

Using the same speed for all feature types

Bridges, overhangs, and small perimeters need slower speeds for cooling. Use modifier speeds or adaptive speed for quality-critical features.

FAQ

It is the volume of molten plastic extruded per second (mm³/s). It is the true speed limit — high mm/s with thin layers may be fine while moderate mm/s with thick layers maxes the hotend.

Run a volumetric flow test tower in your slicer, increasing flow until extrusion skips or quality degrades. Stock V6: ~10–12 mm³/s; Dragon/Volcano: 20–30+ mm³/s.

Yes. Outer walls typically 30–50% of infill speed for surface quality. Infill and inner walls can run at calculated max flow; externals prioritize appearance.

Higher temperature reduces viscosity, allowing higher flow. Increase 5–10°C when pushing speed limits, but watch for stringing and heat creep on all-metal hotends.

You exceeded volumetric flow capacity or cooling time on small layers. Reduce speed, increase temperature, or increase layer height/nozzle size.

About Print Speed Calculator

Print speed must stay within your hotend's volumetric flow limit or extrusion fails. This calculator derives maximum print speed from flow rate (mm³/s), layer height, and line width.