Vertical shell speed
How fast the stretches of solid infill that rest over hollow space under a sloped face are printed. It's a percentage of the internal solid infill speed: lower means cleaner sloped faces.
How it works
When the slicer adds solid infill under a sloped face to guarantee the shell thickness, part of that infill lands on hollow infill or on nothing at all. Those stretches, found by “Detect floating vertical shells”, are printed at this lower speed so they don't sink or fray.
At 80% (the factory value) they run at 200 mm/s if the solid infill is at 250 mm/s.
When to change it
- A dome or the sloped roof of a little house that comes out stringy or sunken: lower it to 50%.
- The usual choice: leave it at 80%.
Typical values
| Value | What for |
|---|---|
| 50% | Cleaner sloped faces |
| 80% | Defaultdefault |
| 100% | Same as solid infill |
Watch out for
- Because it is a percentage, it follows the “Internal solid infill” speed: if you lower that one, this one drops with it without you touching it.
Goes well with
What Bambu Studio saysits help card, quoted
What Bambu Studio says
Speed for vertical shells with overhang regions. If expressed as percentage (for example: 80%) it will be calculated onthe internal solid infill speed above
Bambu Studio tooltip for this setting · AGPL-3.0
Read more at the official source
In your profile0.20mm Standard @BBL A1 · 80%
In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to80%
Using another slicer? Look for the idea, not the name: in Orca Slicer almost everything has the same name; in PrusaSlicer or Cura it may be called something else, or not exist.