Bottom interface layers
How many dense layers a normal support puts down where it starts on top of the part. At 0 it starts with loose lines and holds poorly; at −1 it uses the same number as the top interface.
How it works
When a normal support starts on a face of the part, its first layer would be a handful of loose lines on that face: they grip poorly and the rest of the support leans. A two-layer bottom interface gives it a continuous base.
It also protects the part's face: a dense sheet leaves a more even mark than a few thick lines.
When to change it
- For almost anything: 2, the default.
- A seated figure with an arm stretched over its knee, where the support starts on top of the leg and falls over: 3.
- −1, if you want it to always match “Top interface layers”.
Typical values
| Value | What for |
|---|---|
| 2 | Defaultdefault |
| −1 | Same as top |
| 3 | Sturdier supports on the part |
Watch out for
- It only exists for normal supports: tree supports don't use a bottom interface, and the option is hidden when you choose them.
Goes well with
What Bambu Studio saysits help card, quoted
What Bambu Studio says
Number of bottom interface layers
Bambu Studio tooltip for this setting · AGPL-3.0
Read more at the official source
In your profile0.20mm Standard @BBL A1 · 2 layers
In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to2 layers
In other slicers
- Orca Slicer
- Bottom interface layersSupport › Advanced
- PrusaSlicer
- Bottom interface layersSupport material › Options for support material and raft
- Cura
- Support Floor ThicknessSupportIn Cura it's a thickness in mm, not a number of layers.
Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits