Process › Strength› Sparse infillsparse_infill_density
Infill density
In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to15%
It changes with the Bambu Lab A1 factory profile:0.08mm Extra Fine15%0.08mm High Quality15%0.12mm Fine15%0.12mm High Quality15%0.16mm High Quality15%0.16mm Optimal15%0.20mm Standard15%0.20mm Strength25%0.24mm Draft15%0.28mm Extra Draft15%Why does it change?
How much of the inside of the part is filled with plastic. 15% already holds up most parts; 100% is almost never worth it.
How it works
The inside of the part isn't solid: it's filled with a hollow pattern, and the percentage says how much of that volume is plastic. Its main job is to support the layers above and add some stiffness, not to make the part “strong”: that's what the walls are for.
Time and weight rise almost in step with density. Going from 15% to 40% nearly triples the plastic in the infill, but the part doesn't get anywhere near three times stronger.
When to change it
- A large figure or a decorative vase: 5–10%.
- A desk organizer, a box or a phone stand: 15–25%.
- The leg of a small piece of furniture, a door stop, or a part where you'll drive screws in anywhere: 40–60%.
- A hook or a bracket that could snap when bent: add walls before adding infill.
Typical values
| Value | What for |
|---|---|
| 5–10% | Decorative, maximum savings |
| 15% | Bambu standard; works for almost everythingdefault |
| 25–40% | Functional parts with moderate load |
| 60–100% | Parts that get squeezed or hit; small solid parts |
Watch out for
- With very low infill, you need more top layers so the top doesn't sag.
- With “Grid” above 40%, the nozzle passes over freshly printed lines and causes noise and vibration; at high densities, switch to “Gyroid” or “Rectilinear”.
- At 100%, use “Rectilinear”: it's the one that leaves no gaps and doesn't pile up extra plastic.
Goes well with
What Bambu Studio says
Density of internal sparse infill, 100% means solid throughout
Bambu Studio tooltip for this setting · AGPL-3.0