Flow Rate

Introduction

Calibrating the Flow Rate (Extrusion Multiplier) is a crucial step in improving print quality, especially if you're experiencing issues with under- or over-extrusion.

Requirements

• Slicer

• Smooth Calibration Cube from Printables

Test Print

The best way to calibrate is by printing a thin-walled object:

1. Prepare a 20x20x20 mm cube model in Orca Slicer:

   • Top Layers = 0

   • Bottom Layers = 1-2 (to ensure adhesion)

   • Infill = 0%

   • Perimeters = 1

   • Line Width = 0.42 mm (do not change it to 0.4 mm!)

   • Flow Rate = 100% (as a starting point)

2. Print and measure the wall thickness using calipers.

3. If the measured thickness differs from 0.42 mm, calculate a new Flow Rate value.

Flow Rate Adjustment Based on Line Width

Too Much Filament

• Set Line Width: 0.42 mm

• Measured wall thickness: 0.46 mm

• Flow Rate set to 100%

→ New Flow Rate: 91%

Too Little Filament

• Set Line Width: 0.42 mm

• Measured wall thickness: 0.38 mm

• Flow Rate set to 100%

→ New Flow Rate: 111%

Applying the Adjustment in Orca Slicer

• Orca Slicer → Filament Settings → Flow Rate (Extrusion Multiplier)

• Enter the new value.

• Reprint the test model.