Calibration Input Form
Enter one commanded extrusion length and three measured extrusion results. Averaging multiple trials improves repeatability and reduces one-off measurement bias.
Extrusion Comparison Graph
The chart compares your target length with each test result and the averaged extrusion value.
Example Data Table
These sample values show how a slightly under-extruding machine produces a higher corrected steps-per-mm recommendation.
| Printer | Current Steps/mm | Commanded Length | Test 1 | Test 2 | Test 3 | Average Actual | Suggested Steps/mm |
|---|---|---|---|---|---|---|---|
| Direct Drive A | 93.0000 | 100.0000 mm | 96.2000 mm | 96.5000 mm | 96.1000 mm | 96.2667 mm | 96.6017 |
| Bowden B | 98.5000 | 120.0000 mm | 118.6000 mm | 118.2000 mm | 118.5000 mm | 118.4333 mm | 99.8043 |
| Compact C | 415.0000 | 50.0000 mm | 49.6000 mm | 49.7000 mm | 49.5000 mm | 49.6000 mm | 418.3468 |
Formula Used
new_steps = current_steps × (commanded_length ÷ average_actual_length)
error_mm = commanded_length − average_actual_lengtherror_percent = (error_mm ÷ commanded_length) × 100
flow_ratio = commanded_length ÷ average_actual_lengthflow_percent = flow_ratio × 100
area = π × (filament_diameter ÷ 2)²volume = area × length
The average of three measurements reduces random measuring noise and gives a steadier calibration recommendation.
How to Use This Calculator
- Read your current extruder steps-per-mm from firmware or printer settings.
- Mark filament and command a known extrusion length, often 100 mm.
- Measure how much filament was actually extruded for three trials.
- Enter the three measured values, filament diameter, and tolerance.
- Press Calculate Calibration to show results above the form.
- Save the suggested steps value in firmware, EEPROM, or your machine profile.
- Repeat the test after updating settings to confirm the new average matches the target length.
FAQs
1) Why should I average three extrusion tests?
Averaging removes small measuring mistakes and temporary feed variations. That gives a more stable correction value than trusting one single test.
2) What is a good commanded extrusion length?
100 mm is popular because it is easy to mark, easy to measure, and large enough to reveal meaningful extruder error.
3) Does filament diameter change the new steps value?
No. The corrected steps calculation uses commanded and measured length. Diameter affects the volume estimates shown in the report.
4) What if my error is already within tolerance?
You may leave the current setting unchanged. Small differences can fall within normal measuring noise and real-world printer variation.
5) Why is repeatability important?
If your three tests vary a lot, the extruder may be slipping, the nozzle may be restricted, or the measurement method may be inconsistent.
6) Should I calibrate with the nozzle hot?
Yes, most real calibration tests should use normal printing temperature. Cold tests ignore melt resistance and can distort actual feeding behavior.
7) Can I use this for direct drive and Bowden systems?
Yes. The method works for both setups because it corrects steps from measured movement versus commanded movement.
8) After saving new steps, what should I do next?
Run another three-test cycle. Confirm the new average closely matches the target before tuning flow, pressure, or dimensional settings.