Max volumetric slope (increase)
How much the plastic flow (how many mm³ come out of the nozzle per second) can rise each second. It prevents sudden jumps, which leave bulges or gaps. 0 turns it off.
How it works
When the head goes from a thin, slow line to a wide, fast one, the amount of plastic that has to come out jumps all at once. The plastic doesn't react instantly: the start of the stretch comes out short on material and then gets too much. This limit forces the flow to rise gradually (so many mm³/s every second) and smooths out those changes.
It's a fine-tuning setting, meant mainly for printers that don't compensate nozzle pressure well (no calibrated pressure advance).
When to change it
- Most parts: leave 0.
- A phone stand with bulges or gaps right where the nozzle switches from infill to wall: try 20–40.
Typical values
| Value | What for |
|---|---|
| 0 | Default; no limitdefault |
| 30 | Smoothed flow changes |
Watch out for
- If you limit it a lot, parts with many line-type changes take longer.
Goes well with
What Bambu Studio saysits help card, quoted
Read more at the official source
In your profile0.20mm Standard @BBL A1 · 0 mm³/s²
In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to0 mm³/s²
In other slicers
- Orca Slicer
- Extrusion rate smoothingSpeed › AdvancedA single value for flow going up and going down.
- PrusaSlicer
- Max volumetric slope positiveSpeed › Pressure equalizer (experimental)
- Cura
- Gradual flow max accelerationMaterialA single value for raising and lowering the flow; it needs gradual_flow_enabled.
Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits