Top layers slicing regression in V2.3.1-Alpha Release #2337

New Issue

MrUnknownDE · 2026-04-06T04:21:56+02:00

MrUnknownDE commented

2026-04-06 04:21:56 +02:00

Originally created by @arlophoenix on 8/28/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

V2.3.1-Alpha build 90a6c53

Operating System (OS)

macOS

OS Version

MacOS 15.6

Additional system information

No response

Printer

Creality K1C

How to reproduce

Using V2.3.1-Alpha (tested on tagged build 6ae89f7 and nightly build 90a6c53) with default profile Creality K1C 0.4 nozzle / Creality Generic PLA High Speed / 0.12mm Fine @Creality K1C
Edit the profile from 3 walls (default) to 2 walls. Note: Top Shell Layers = 5
Import the example object

Small Coin Shim Half.stl.zip

Slice the project
View the 2nd to top layer (ie the layer beneath the top layer)

Actual results

V2.3.1-alpha

Note there are no layers beneath the top layer - the object is hollow

Expected results

V2.3.0

Note there are solid infill layers beneath the top layer

Project file & Debug log uploads

Small Coin Shim Half.3mf.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @arlophoenix on 8/28/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version V2.3.1-Alpha build 90a6c53 ### Operating System (OS) macOS ### OS Version MacOS 15.6 ### Additional system information _No response_ ### Printer Creality K1C ### How to reproduce 1. Using V2.3.1-Alpha (tested on tagged build 6ae89f7 and nightly build 90a6c53) with default profile Creality K1C 0.4 nozzle / Creality Generic PLA High Speed / 0.12mm Fine @Creality K1C 2. Edit the profile from 3 walls (default) to 2 walls. Note: Top Shell Layers = 5 3. Import the example object [Small Coin Shim Half.stl.zip](https://github.com/user-attachments/files/22034198/Small.Coin.Shim.Half.stl.zip) 4. Slice the project 5. View the 2nd to top layer (ie the layer beneath the top layer) ### Actual results V2.3.1-alpha <img width="5120" height="2832" alt="Image" src="https://github.com/user-attachments/assets/6bd0e259-eb79-462e-a83f-f6319d628478" /> Note there are no layers beneath the top layer - the object is hollow ### Expected results V2.3.0 <img width="5120" height="2824" alt="Image" src="https://github.com/user-attachments/assets/c3bd8b9e-d554-463b-94a1-a862a0f4eee9" /> Note there are solid infill layers beneath the top layer ### Project file & Debug log uploads [Small Coin Shim Half.3mf.zip](https://github.com/user-attachments/files/22034241/Small.Coin.Shim.Half.3mf.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#2337