Nozzle Flow Calculator

Calculate nozzle volumetric extrusion rates in cubic millimeters per second (mm³/s). Optimize slicer speed settings to prevent clicking extruders.

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How to Use Nozzle Flow Calculator

  1. Enter your layer height, extrusion line width, and printing speed (mm/s).
  2. Instantly calculate required volumetric flow rate in mm³/s.
  3. Compare with your hotend hardware specifications to verify safety headroom.

What is the Nozzle Flow Calculator?

Determines the instantaneous volumetric output of molten plastic required by your toolhead at any given velocity.

Formula Used

• Volumetric Flow (mm³/s) = Layer Height (mm) × Extrusion Width (mm) × Linear Speed (mm/s)

Real-World Example

Printing at 0.28mm layer height, 0.60mm line width, and 120 mm/s speed: • Flow Rate = 0.28 × 0.60 × 120 = 20.16 mm³/s (requires high-flow hotend).

Accuracy and Limitations

Actual melt rates are influenced by nozzle material (brass vs hardened steel vs tungsten carbide).

Who It Is For

Makers upgrading to 0.6mm/0.8mm nozzles or tuning high-speed slicer profiles.

Frequently Asked Questions

What happens if nozzle flow exceeds hotend capacity?
When required flow exceeds thermal melt capacity, the extruder gear skips and clicks against the filament, resulting in under-extrusion, weak layer bonding, and spongy infill.