FDM Calibration Notes

Practical notes for setting up and calibrating an FDM 3D printer with Orca Slicer.

Why Calibration Order Matters

Orca Slicer provides several calibration tools, but it is easier to obtain consistent results when the tests are performed in a logical order.

Changing an important extrusion setting after completing several other tests may affect the values you already calibrated.

Recommended order:
Temperature → Flow Rate → Pressure Advance → Retraction → Dimensional Validation

Start by finding a nozzle temperature that produces stable extrusion, good layer bonding and acceptable stringing.

Temperature should normally be established first because it can affect several other aspects of filament behaviour.

Once temperature is stable, calibrate flow rate.

Too much flow can produce rough top surfaces and excess material, while insufficient flow can leave visible gaps and inconsistent extrusion.

Pressure advance helps compensate for pressure changes inside the nozzle when the printer accelerates or slows down.

A suitable value can improve corner quality and extrusion consistency.

Retraction mainly helps reduce unwanted filament during travel moves.

It is better to tune retraction after temperature and basic extrusion behaviour are already reasonably stable.

Finish with a small dimensional test print. Allow the model to cool completely and measure it with digital calipers.

Look for repeatable differences instead of changing printer settings because of a single measurement.

For explanations of the individual tests and a broader tuning workflow, see the Orca Slicer calibration reference .

Change one major variable at a time. Run the test, inspect the result, save the successful value and then continue to the next calibration step.