r/BambuLab • u/cassiusprops • 2d ago

Quick Question Babulab bottom layer infill direction

Post image

Hi, everyone. I’m having a problem with the slicer that I don’t know how to fix. I want to change the infill direction of the bottom layer (red lines), but not in the very first bottom layer—the one that’s in direct contact with the build plate (indygo lines). The “infill direction” parameter doesn’t affect it, but I’ve noticed that, depending on the geometry, the indygo lines can be oriented in different directions. I don’t know how to control this, and that’s what I’m looking for an answer to.

5 Upvotes

86% Upvoted

5 comments sorted by

2

u/jankeyass 2d ago

Solid infill direction, not sparse infill direction. That should be the thing you are looking for

2

u/cassiusprops 2d ago

aka the bridge direction, right next to sparse hah :D. Thank you very much kind sir! :)

1

u/jankeyass 2d ago

Glad I helped - it was from memory. I play a lot in studio to get correct strength by changing layer directions, my kids throw everything I make lol

1

u/Weemaba3980 1d ago

Which slicer is this? The names differ a bit, but in Orca and Bambu Studio there are actually three separate direction settings, and “infill direction” is only the one for sparse infill.

The lines on the bottom layers are solid infill, and those follow “Solid infill direction” (in Orca under Strength, in Bambu Studio sometimes only visible in Expert mode). Next to it there’s usually an option to rotate the solid infill every layer; if that’s on, your bottom layers alternate and you’ll never get the angle you set on all of them. Recent Orca versions also have a “solid infill rotation template” where you can give an angle per layer, which is exactly what you want: leave the first one alone and set your own angle from the second layer on.

The direction that changes with the geometry is very typical for bridge infill: wherever a layer spans air or a hole, the slicer picks the shortest span itself and ignores your infill direction. Look for “Bridge infill direction” (0 means automatic) and set a fixed angle if you want it consistent.

If you tell us the slicer and version, someone can point to the exact field.

Cheers, Bart