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Process › Strength› Sparse infillconformal_hub_radius

Center region radius

With conformal infill: the size of the center circle that gets filled with regular lines; the spokes go outside it. At 0, the slicer picks it.

Not always visible. In Bambu Studio this setting only shows up when “Sparse infill pattern” is “Zig Zag” or “Cross Zag” or “Locked Zag” or “Rectilinear” or “Aligned Rectilinear” and “Conformal infill” is on. See Sparse infill pattern, Conformal infill.

How it works

Spokes get closer and closer together near the center, until they crowd up. To avoid that, the center area is filled with regular straight lines and the spokes start from this distance outward. At 0 the slicer picks the size; a number above 0 sets it in millimeters.

When to change it

  • In the preview you see the spokes crowding at the center of a round lid or a knob: raise it to 5 or 10 mm.
  • A large round part, like a lamp base, where you'd rather have fewer spokes and a wide center: 15 mm.
  • The usual: 0.

Typical values

ValueWhat for
0Default; automaticdefault
5Center with a 5 mm radius
15Large center; fewer spokes

Watch out for

  • It only shows up when conformal infill is on.

Goes well with

Conformal infillRadial line countRadial center
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Radius of the center region that uses ordinary rectilinear infill; outside this circle the infill stays radial. 0 chooses the radius automatically. A positive value is in millimeters.

Bambu Studio tooltip for this setting · AGPL-3.0

Read more at the official source

Bambu Lab wiki (index)
In your profile0.20mm Standard @BBL A1 · 0 mm

In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to0 mm

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.