Odd gaps in internal solid infill #1778

New Issue

MrUnknownDE · 2026-04-05T19:50:48+02:00

MrUnknownDE commented

2026-04-05 19:50:48 +02:00

Originally created by @dazole on 10/29/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1

Operating System (OS)

macOS

OS Version

MacOS 26.01

Additional system information

No response

Printer

Bambulab X1C and P1S

How to reproduce

Create an object, like a cube
Add a modifier that to the cube and place it on layer 2. Make sure the modifier is smaller than the X or Y size. In other words, either on X or Y, the modifier should be inside the walls of the object.
change the filament/color of the modifier to a filament/color different than the original object.
Slice and look at the gaps

Actual results

This bug appeared between versions 2.3.0 and 2.3.1-alpha of OrcaSlicer (2.3.0 doesn't show this bug). When slicing an object with a modifier of a different color on layer 2, OrcaSlicer is leaving some gaps in the internal solid infill. See the attached images.

Also, these settings did not make a difference: Changing to Arachne, Detect thin walls

Expected results

I'd expect the layer to not have gaps, rather more internal solid infill

Project file & Debug log uploads

PWC - Lewis countertops.3mf.zip

Checklist of files to include

Log file
Project file

Anything else?

*Originally created by @dazole on 10/29/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 ### Operating System (OS) macOS ### OS Version MacOS 26.01 ### Additional system information _No response_ ### Printer Bambulab X1C and P1S ### How to reproduce 1. Create an object, like a cube 2. Add a modifier that to the cube and place it on layer 2. Make sure the modifier is smaller than the X or Y size. In other words, either on X or Y, the modifier should be *inside* the walls of the object. 3. change the filament/color of the modifier to a filament/color different than the original object. 4. Slice and look at the gaps ### Actual results This bug appeared between versions 2.3.0 and 2.3.1-alpha of OrcaSlicer (2.3.0 doesn't show this bug). When slicing an object with a modifier of a different color on layer 2, OrcaSlicer is leaving some gaps in the internal solid infill. See the attached images. Also, these settings did not make a difference: Changing to Arachne, Detect thin walls ### Expected results I'd expect the layer to not have gaps, rather more internal solid infill ### Project file & Debug log uploads [PWC - Lewis countertops.3mf.zip](https://github.com/user-attachments/files/23219630/PWC.-.Lewis.countertops.3mf.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? ![Image](https://github.com/user-attachments/assets/74c0e3e7-5ae3-48ae-9054-ab04a402d921) ![Image](https://github.com/user-attachments/assets/7d9831ea-f257-408d-b38d-5a36f08d5a3c)

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Reference: github/OrcaSlicer#1778