Minimum sparse infill threshold
Infill areas smaller than this are printed solid instead of hollow. Raising it keeps narrow parts from ending up fragile; lowering it saves plastic.
How it works
Sparse infill works well in large areas. In a rib (a thin reinforcing fin) or a narrow ledge, the pattern barely fits: you get two or three loose lines that hold up poorly. With this threshold, any inner area under 15 mm² is switched to solid infill.
It's measured on each layer: 15 mm² is roughly a 4 × 4 mm square.
When to change it
- A clamp or clip with thin tabs that snap: raise it to 30 or 50 mm².
- A decorative figure where you want to use as little plastic as possible: lower it to 5 mm².
Typical values
| Value | What for |
|---|---|
| 0 | Never switches to solid |
| 15 | Defaultdefault |
| 50 | Functional parts with narrow sections |
| 100 | Almost every small area ends up solid |
Watch out for
- A very high threshold turns medium-sized areas solid: more plastic and more time with no noticeable gain in strength.
- The converted areas use the internal solid infill pattern, not the sparse infill one.
Goes well with
What Bambu Studio saysits help card, quoted
What Bambu Studio says
Sparse infill area which is smaller than threshold value is replaced by internal solid infill
Bambu Studio tooltip for this setting · AGPL-3.0
Read more at the official source
In your profile0.20mm Standard @BBL A1 · 15 mm²
In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to15 mm²
In other slicers
- Orca Slicer
- Minimum sparse infill thresholdStrength › Advanced
- PrusaSlicer
- Solid infill threshold areaInfill › Advanced
- Cura
- Minimum Infill AreaInfill
Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits