Arachne causing facets on circular features

[OsmosisD]

Is there an existing issue for this problem?

• [X] I have searched the existing issues

OrcaSlicer Version

2.1.1

Operating System (OS)

Windows

OS Version

Windows 10

Additional system information

CPU: AMD Ryzen 7 5800X RAM: 64Gb DDR4 GPU: NVIDIA GeForce GTX 1650 SUPER

Printer

Creality CR-100 (Generic Marlin Printer)

How to reproduce

Slice any circular object using Arachne as the wall generator.

Actual results

Outer walls come out with distinct facets that also show up on the print. More visible from higher vertical angles.

This seems to happen regardless of other slicer settings. Changing resolution to very low numbers does help a little, but increases slicing time significantly.

Expected results

Arachne should produce smooth(er) walls. The facets still exist when slicing with Classic wall generator, but come out half the length and so are much less noticeable. They also don't have a random offset in the middle.

Project file & Debug log uploads

cylinder.zip debug_Thu_Jul_18_16_26_07_23104.log.0.zip

Checklist of files to include

• [X] Log file
• [X] Project file

Anything else?

Some further investigation seems to indicate this is an issue with Prusa Slicer's implementation of Arachne (it doesn't happen in Cura). Should I move the bug report there?

[CristianGTR97]

I've noticed this too

[github-actions[bot]]

Orca bot: this issue is stale because it has been open for 90 days with no activity.

[jwlister]

Has there been any progress on this issue? I'm encountering the exact same problem three months later.