Arc Fitting on H2S - ON or OFF? Studio warns to disable but it's ON by default!

Bambu Lab H2 Series Bambu Lab H2S
1

Hey everyone!

I’ve been running into something confusing with Arc Fitting on the H2S and wanted to see if others have experienced this.

Here’s my issue: Bambu Studio throws an error/warning message telling me to DISABLE Arc Fitting — but when I check the default H2S base profile, Arc Fitting is already enabled (ON) out of the box! So why is Bambu Studio prompting me to turn it off if they shipped the profile with it enabled?

For those unfamiliar, Arc Fitting (G2/G3 arc commands) replaces straight-line segment moves with actual arc movements in the G-code. The idea is smoother motion, potentially better surface quality and reduced file size.

A few questions for the community:

  1. Have you seen this same error/warning in Bambu Studio about Arc Fitting on the H2S?
    1. Do you run Arc Fitting ON or OFF on your H2S?
      1. Have you tested both and noticed any difference in print quality or reliability?
        1. Any idea why Bambu would enable it in the base profile but then warn against it?
      3. Would love to hear your experiences and whether you’ve done any testing. Trying to figure out if this is a bug in the software, a profile inconsistency, or something intentional.
    3. Thanks!
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I get it sometimes too. H2c

3

Bambu Studio is just telling you it detected the firmware‑side curve planning enhancement, so it has turned off its own arc fitting to avoid conflicts.