One Wall on Top Surfaces enabled causes random inner wall issues #1906

New Issue

MrUnknownDE · 2026-04-05T21:03:50+02:00

MrUnknownDE commented

2026-04-05 21:03:50 +02:00

Originally created by @mputtr on 10/15/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1

Operating System (OS)

Windows

OS Version

10

Additional system information

i9 9900K
RTX 2080 Ti
64gb ddr4

I've been running into this odd issue that apparently has been around at least a year. Whenever I have "Only one wall on top surfaces" enabled, some top surfaces will get these random inner walls scrawled across it and mess up the look of the print. you can see in the pictures below:

you can see the random yellow inner wall lines

2) this is what the top surface layer for that graphic where the random innerwall line is generated for no reason

3) this is what it looks like 1 layer later. very visible

Printer

Flashforge AD5M Pro

How to reproduce

Enable: Only one wall on top surfaces
slice a print

Actual results

random inner walls created on top surface

Expected results

no random inner wall on top surfaces

Project file & Debug log uploads

log.zip

Test print.zip

Checklist of files to include

Log file
Project file

Anything else?

I've also noticed that this issue has been going on for atleast 1 year
https://www.reddit.com/r/OrcaSlicer/comments/1cgavhu/strange_error_with_orcaslicer_creates_useless/

*Originally created by @mputtr on 10/15/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 ### Operating System (OS) Windows ### OS Version 10 ### Additional system information i9 9900K RTX 2080 Ti 64gb ddr4 I've been running into this odd issue that apparently has been around at least a year. Whenever I have "Only one wall on top surfaces" enabled, some top surfaces will get these random inner walls scrawled across it and mess up the look of the print. you can see in the pictures below: 1) you can see the random yellow inner wall lines <img width="2643" height="1229" alt="Image" src="https://github.com/user-attachments/assets/7451828a-53a7-4776-8a2c-a49b0785774a" /> 2) this is what the top surface layer for that graphic where the random innerwall line is generated for no reason <img width="2588" height="1246" alt="Image" src="https://github.com/user-attachments/assets/8c22dd80-f831-416f-bc62-5db1cf2f6085" /> 3) this is what it looks like 1 layer later. very visible <img width="2848" height="1223" alt="Image" src="https://github.com/user-attachments/assets/2409f3c6-1c74-4d20-a688-0d7dada914bc" /> ### Printer Flashforge AD5M Pro ### How to reproduce Enable: Only one wall on top surfaces slice a print ### Actual results random inner walls created on top surface ### Expected results no random inner wall on top surfaces ### Project file & Debug log uploads [log.zip](https://github.com/user-attachments/files/22937418/log.zip) [Test print.zip](https://github.com/user-attachments/files/22956075/Test.print.zip) ### Checklist of files to include - [x] Log file - [x] Project file ### Anything else? I've also noticed that this issue has been going on for atleast 1 year https://www.reddit.com/r/OrcaSlicer/comments/1cgavhu/strange_error_with_orcaslicer_creates_useless/

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Reference: github/OrcaSlicer#1906