Max volumetric speed
How much plastic per second the nozzle can melt with this filament. The printer never asks for more, whatever the Process speeds say.
How it works
Each line needs a volume of plastic per second: width × layer height × speed. If that exceeds this maximum, the printer slows down on its own. That's why with thick layers or wide lines the printer runs slower than you set.
The right value comes from the test in Calibration › More... › Max flowrate.
When to change it
- You switched to a “high speed” filament or a high-flow nozzle: run the test and raise it.
- Gappy or rough walls at high speed: the maximum may be too high for your spool; lower it.
Typical values
| Value | What for |
|---|---|
| 21 mm³/s | PLA Basicdefault |
| 12 mm³/s | PLA (base profile) |
Watch out for
- It can't be 0.
- Raising it without running the test doesn't make the nozzle melt more: it only lets the printer ask for more than it can deliver.
Goes well with
What Bambu Studio saysits help card, quoted
What Bambu Studio says
This setting stands for how much volume of filament can be melted and extruded per second. Printing speed is limited by max volumetric speed, in case of too high and unreasonable speed setting. Can't be zero
Bambu Studio tooltip for this setting · AGPL-3.0
Read more at the official source
In your profileBambu PLA Basic @BBL A1 · 21 mm³/s
In Bambu Studio, the profile Bambu PLA Basic @BBL A1 sets it to21 mm³/s
Helps with
In other slicers
- Orca Slicer
- Max volumetric speedFilament › Volumetric speed limitation
- PrusaSlicer
- Max volumetric speedAdvanced › Print speed override
- Cura
- No clear equivalent.
Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits