Sparse infill speed
How fast the inside infill is printed. It's where you save the most time, because nobody sees it; the limit is the filament's flow (how much plastic it melts per second).
How it works
Infill is long lines inside the part. They aren't visible and don't need a finish, so they can go as fast as the nozzle can handle. At 270 mm/s, with 0.45 mm lines and 0.20 mm layers, it asks for 24 mm³/s, already above the limit for PLA Basic (21 mm³/s): the printer trims it a little on its own.
Raising the number further doesn't save time; to really speed up the infill you need to lower the density or change the pattern.
When to change it
- The usual choice: leave it at 270 mm/s.
- A monitor stand or a part with dense infill (40% or more) where the infill is noisy or pulls away from the walls: lower it to 150–200 mm/s.
Typical values
| Value | What for |
|---|---|
| 150 | Quiet; dense infill |
| 270 | Defaultdefault |
| 350 | Only with high-flow filaments |
Watch out for
- With the “Grid” pattern above 40% density, high speed makes the nozzle bump into the crossings: switch to “Gyroid”.
- The actual speed is also capped by the filament's flow and by the minimum layer time needed for cooling.
Goes well with
What Bambu Studio saysits help card, quoted
What Bambu Studio says
Speed of internal sparse infill
Bambu Studio tooltip for this setting · AGPL-3.0
Read more at the official source
In your profile0.20mm Standard @BBL A1 · 270 mm/s · changes with the profile
In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to270 mm/s
In other slicers
- Orca Slicer
- Sparse infillSpeed › Other layers speed
- PrusaSlicer
- InfillSpeed › Speed for print moves
- Cura
- Infill SpeedSpeed
Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits