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Process › Strength› Top/bottom shellsbottom_surface_pattern

Bottom surface pattern

The pattern the lines make on the face that touches the plate. On a textured plate you barely notice it; on a smooth plate, “Monotonic” gives the most even face.

How it works

The first layer gets pressed against the plate and copies its texture: on a textured plate, the line pattern is barely visible. On a smooth plate you can see it, and there it pays to use a pattern that doesn't leave marks at every change of direction.

“Monotonic” (the default) prints every line in the same direction. “Rectilinear” goes back and forth, and is a bit faster. The rest are decorative.

When to change it

  • Any part printed on a textured plate: it doesn't matter, leave “Monotonic”.
  • A coaster or a fridge magnet printed on a smooth plate, with the bottom on display: “Monotonic”, or “Concentric” if the base is round.
  • A decorative plaque that hangs on the wall and whose back face also shows: “Hilbert Curve” or “Archimedean Chords”.

Typical values

ValueWhat for
MonotonicDefault; even basedefault
RectilinearA bit faster
ConcentricRound bases
Hilbert / Archimedean / octagramDecorative

Watch out for

  • The first-layer pattern affects how well it sticks to the plate: the decorative ones, with lots of turns, stick a little worse.
  • It doesn't change areas printed in mid-air, like the ceiling of a hole (bridges): those have their own settings.

Goes well with

Bottom shell layersTop surface patternInitial layer infillBottom surface density
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Line pattern of bottom surface infill, not bridge infill

Bambu Studio tooltip for this setting · AGPL-3.0

Read more at the official source

This setting on the Bambu Lab wiki
In your profile0.20mm Standard @BBL A1 · Monotonic

In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it toMonotonic

In other slicers

Orca Slicer
Bottom surface patternStrength › Top/bottom shells
PrusaSlicer
Bottom fill patternInfill
Cura
Bottom Surface Skin PatternTop/BottomOnly used if flooring_layer_count (bottom surface layers) is greater than 0.

Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits