1. What is a Flow Ratio Calculator for 3D Printing?

Definition: This calculator determines the flow ratio (R) by comparing the actual flow rate to the target flow rate in 3D printing extrusion.

Purpose: It helps 3D printing enthusiasts and professionals calibrate their extruder for optimal material flow and print quality.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Flow ratio (dimensionless)
• \( Q_{actual} \) — Actual measured flow rate (mm³/s)
• \( Q_{target} \) — Target flow rate from slicer settings (mm³/s)

Explanation: The ratio indicates how much your actual extrusion differs from the expected flow rate, helping you adjust flow multipliers in your slicer.

3. Importance of Flow Ratio in 3D Printing

Details: Proper flow calibration ensures accurate extrusion, prevents under/over-extrusion, and improves dimensional accuracy of printed parts.

4. Using the Calculator

Tips: Measure actual extrusion rate (e.g., by measuring filament extruded over time) and compare to your slicer's target flow rate. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does a flow ratio of 1 mean?
A: A ratio of 1 means your actual flow perfectly matches the target flow. Values below 1 indicate under-extrusion, above 1 indicate over-extrusion.

Q2: How do I measure actual flow rate?
A: Mark filament, extrude a known length at set speed, measure time taken, and calculate volume extruded per second.

Q3: What's a typical acceptable flow ratio range?
A: Most printers work well between 0.95-1.05, but this varies by material and printer.

Q4: Should I adjust flow ratio or steps/mm first?
A: Calibrate steps/mm first for mechanical accuracy, then use flow ratio for fine-tuning extrusion.

Q5: Does this account for different filament types?
A: No, you should calibrate separately for each filament type as flow characteristics vary.