Bambu Studio Incorrect interpretation of 3MF objects after slicing

[SI3DProject]

Hello everyone! I am reaching out to you for help in diagnosing a problem with Bambu Studio software that occurred during my latest project. The issue concerns the incorrect interpretation of geometry after the slicing process.

Project description: The project is a keychain with an embedded QR code. The model consists of multiple overlapping objects in two colors, exported to .3mf format.

Problem: After slicing the model in Bambu Studio, the software incorrectly interprets the defined solids. As seen in the attached photos (Preview view), fragments of the QR code are being cut out or covered by a black background in an illogical way (characteristic triangular artifacts are formed). Interestingly, everything looks correct in the preview before slicing (Prepare).

What I have already checked and tried:

File format: I previously encountered similar issues with the .obj extension, which is why I switched to .3mf, and until now, everything worked correctly.

Wall generator: I tried changing from Arachne to Classic and vice-versa - unfortunately, this brought no improvement, and the geometry errors are identical in both modes.

Comparison in OrcaSlicer: I sliced the same .3mf file in OrcaSlicer using the same settings. The result? OrcaSlicer interprets the file 100% correctly, which suggests that the problem lies directly in the Bambu Studio engine code or some specific regression in its latest version.

Cross-Platform Testing: I have confirmed this isn’t a local OS issue. The bug persists on both macOS and Windows 11

System:

I am using the version 2.5.0.66 for macOS (MacBook Pro M2).

And testing version 2.5.0.66 for Windows 11

I have H2D Combo printer.

Link to file:

https://drive.google.com/drive/folders/1J2jqxVVs5BYZnvZvnuQWsRZlq5RsVBPI?usp=share_link

Has anyone encountered such a problem with Bambu Studio regarding 3MF files recently? Could it be a matter of some hidden setting or operation that might have changed in an update? I would be grateful for any suggestions because the project is important to me, and currently the only solution seems to be abandoning the official slicer in favor of Orca. I am attaching photos from Bambu Studio and OrcaSlicer for comparison.

Thank you in advance for your help and I wish you trouble-free prints!

[CarbonForge]

…you didn’t attach any photos.

[krellboy]

Attach the photos and 3mf’s to this thread (or upload and provide a google drive link).

[SI3DProject]

Sorry, I forgot to attach the photos. They’re already added.

[Bullocks]

This sorta thing youll probably need to attach the 3mf to get accurate help. To my eye theres not much wrong but youre showing only the internal sliced structure. Is it that your QR code isn’t on the bottom? Check in the left hand Objects tab, make sure the QR code object is aligned to the bottom of the plate, or protruding under the object by 0.01mm [slicer will just fill it in]

[SI3DProject]

I’m sending the file generated in Fusion and the project from Bambu Studio. I sent it to Google Drive because there was a problem sending the files directly to the topic. Pliki Bambu - Google Drive

[Double_K]

Does anyone know if this issue has been resolved. I have the same issue. Thanks.