Flow rate: calibrating filament flow

Flow ratio decides how much plastic comes out: too high bulges walls, too low leaves gaps.

Calibration

1. Dry the filament and preheat to printing temperature.
2. In OrcaSlicer open Calibration > Flow rate and run the test (first pass, then second).
3. Pick the square with the smoothest top surface.
4. Enter the value as Flow ratio in the filament profile.
5. Repeat for every new filament.

Typical values

• PLA: 0.96–1.00
• PETG: 0.93–0.98
• ABS and ASA: 0.92–0.97
• TPU: 0.95–1.05

Note

These are indicative: only your own test result counts. Bambu Lab printers adjust flow automatically.