Slicer fails to generate flat surface when slicing at certain layer heights #1408

New Issue

MrUnknownDE · 2026-04-05T17:36:53+02:00

MrUnknownDE commented

2026-04-05 17:36:53 +02:00

Originally created by @Behem07h on 12/6/2025

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

Windows 10

Additional system information

No response

Printer

Ender 3 V2

How to reproduce

Slice the 3mf provided.
Top and bottom surface are parallel (see screenshots)
at 0.08mm initial layer, 0.06mm layer height, top layer does not cover the whole layer (ie it is a shallow slope)
at 0.08mm initial layer, 0.05mm layer height, top layer covers the whole layer (it is flat and parallel to the bed)

Actual results

erroneous 0.06mm layer height slicing:

correct 0.05mm layer height slicing:

model in FreeCAD showing the surfaces are parallel:

Expected results

The top surface should be one continuous layer, since there are no features thinner than one line width.

Project file & Debug log uploads

custom_stem.zip

log.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @Behem07h on 12/6/2025* ### 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 Windows 10 ### Additional system information _No response_ ### Printer Ender 3 V2 ### How to reproduce - Slice the 3mf provided. - Top and bottom surface are parallel (see screenshots) - at 0.08mm initial layer, 0.06mm layer height, top layer does not cover the whole layer (ie it is a shallow slope) - at 0.08mm initial layer, 0.05mm layer height, top layer covers the whole layer (it is flat and parallel to the bed) ### Actual results erroneous 0.06mm layer height slicing: <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/6983c8ca-7c75-47f6-8388-d1380d6058fe" /> correct 0.05mm layer height slicing: <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/f190c798-2ca8-447d-8fdc-51fffb012847" /> model in FreeCAD showing the surfaces are parallel: <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/f1398cf5-6478-4b75-8c7c-7ab55ac2bb33" /> ### Expected results The top surface should be one continuous layer, since there are no features thinner than one line width. ### Project file & Debug log uploads [custom_stem.zip](https://github.com/user-attachments/files/23978791/custom_stem.zip) [log.zip](https://github.com/user-attachments/files/23978793/log.zip) ### Checklist of files to include - [ ] Log file - [ ] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#1408