Print Speed Calculator
Calculate 3D print speed settings from volumetric flow rate and layer dimensions. Set max speed within extruder and hotend flow limits.
Specialist tool for 3D Printing1 documented formula1 real workflowPrivate in your browser
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Inputs that matter
Model Height, Layer Height, Print Speed, Total Extrusion Length
Output to expect
Print Speed Calculator
How it works
1 documented formula across 1 calculation mode
- Keep 4 bounded inputs within the limits shown beside the fields.
- Confirm that every value uses the unit and time basis shown before comparing scenarios.
- Change one input at a time to see which assumption materially changes the result.
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Reference & details
How it works
Updated July 2026
How it works
Updated July 2026Volumetric 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 × 1.1–1.2Updated: 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
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.