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Process › Quality› Advancedprint_flow_ratio

Object flow ratio

Multiplies all the plastic that comes out of the nozzle for one specific object on the plate. It lets you correct that object without touching the filament profile; it doesn't appear in the global settings.

Per object only. In Bambu Studio this setting is not in the global settings: it shows up when you edit a specific object (the “Objects” tab).

How it works

The base amount of plastic is set by the filament profile (its “Flow ratio”, calibrated for each material). This setting is an extra correction that only exists per object: when you select an object in the “Objects” tab, you can give it a different factor from the rest of the plate.

The final amount is the filament's multiplied by this one. At 1 nothing changes; the useful range is 0.95 to 1.05.

When to change it

  • A plate with several parts where one gear comes out with too much plastic (fat teeth, flash) and the rest come out fine: lower just that one to 0.97.
  • A homemade calibration test: print several copies of a cube on the same plate, each with its own factor (0.96, 0.98, 1, 1.02), and keep the one that looks best.

Typical values

ValueWhat for
0.97Object with too much plastic
1Defaultdefault
1.03Object with too little plastic

Watch out for

  • If everything you print with a filament comes out with too much or too little plastic, calibrate the filament's flow instead of changing this on each part.
  • In the program it's called “Object flow ratio”, and it only shows up with developer mode turned on and while editing an object.

Goes well with

Top surface flow ratioInitial layer flow ratioBridge flow
What Bambu Studio saysits help card, quoted

What Bambu Studio says

The flow ratio set by object, the meaning is the same as flow ratio.

Bambu Studio tooltip for this setting · AGPL-3.0

Read more at the official source

Bambu Lab wiki (index)
In your profile0.20mm Standard @BBL A1 · 1

In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to1

In other slicers

Orca Slicer
Flow ratioQuality › Walls and surfaces
PrusaSlicer
No clear equivalent.
Cura
FlowMaterialAs a % (100% = 1.0). Cura doesn't separate the object's flow from the filament's flow.

Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits