Only one wall on top surfaces
On flat top faces it uses a single wall instead of the usual ones, so the surface pattern covers more area and the top looks more even.
How it works
With 2 walls, you see a double ring of lines around each top and then the surface pattern. With a single wall, the ring is thinner and the pattern reaches almost to the edge: the top looks like one piece.
“Top surfaces” (the default) applies it to every flat face that points up, including the in-between steps. “Topmost surface” applies it only to the highest face of the part. “Not apply” keeps the normal walls everywhere.
When to change it
- A box, a lid or a sign: leave it on “Top surfaces”, which works for almost everything.
- A stepped part, like a base with narrow steps that come out weak with a single wall: “Topmost surface”, or raise “Top area threshold”.
- A lid you're going to sand, or a part whose top edge takes bumps or load: “Not apply”.
Typical values
| Value | What for |
|---|---|
| Top surfaces | Default; every flat face on topdefault |
| Topmost surface | Only the highest face |
| Not apply | Normal walls everywhere |
Watch out for
- A single wall leaves a weaker edge, especially if there are threads or screws near the edge of the top.
- On sloped or domed surfaces it makes the stair-step effect worse, so it's not a good fit for those shapes.
- Turning it on reveals “Top area threshold”, which lets you leave out narrow surfaces.
Goes well with
What Bambu Studio saysits help card, quoted
What Bambu Studio says
Use only one wall on flat top surface, to give more space to the top infill pattern. Could be applied on topmost surface or all top surface.
Bambu Studio tooltip for this setting · AGPL-3.0
Read more at the official source
In your profile0.20mm Standard @BBL A1 · Top surfaces
In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it toTop surfaces
In other slicers
- Orca Slicer
- Only one wall on top surfacesQuality › Walls and surfacesIt's a checkbox: it doesn't tell all top surfaces apart from only the topmost one.
- PrusaSlicer
- Single perimeter on top surfacesLayers and perimeters › Only one perimeter
- Cura
- No clear equivalent.
Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits