Internal bridge supports not generated for nonlinear solid infill patterns #963

New Issue

MrUnknownDE · 2026-04-05T16:38:08+02:00

MrUnknownDE commented

2026-04-05 16:38:08 +02:00

Originally created by @StringMon on 1/27/2026

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 11

Additional system information

No response

Printer

Bambu Lab A1

How to reproduce

Create any model with sparse infill and vertical walls. Example below was the default Cube primitive.
On the Process > Strength tab, select an internal solid infill pattern that doesn't just use simple straight lines, such as Concentric
Slice the plate

Actual results

No internal bridge support is generated at the last sparse infill layer.

(I used Tri-hexagon sparse infill here because it makes the issue more obvious in a screenshot, but sparse infill pattern doesn't seem to affect the behavior.)

Expected results

Infill bridge support should be generated.

Project file & Debug log uploads

No_internal_bridge_support.zip

Checklist of files to include

Log file
Project file

Anything else?

Issue exists for Concentric, Archimedean Chords, Hilbert Curves, and Octagram Spiral solid infill patterns.

*Originally created by @StringMon on 1/27/2026* ### 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 11 ### Additional system information _No response_ ### Printer Bambu Lab A1 ### How to reproduce 1. Create any model with sparse infill and vertical walls. Example below was the default Cube primitive. 2. On the Process > Strength tab, select an internal solid infill pattern that doesn't just use simple straight lines, such as Concentric 3. Slice the plate ### Actual results No internal bridge support is generated at the last sparse infill layer. <img width="1233" height="830" alt="Image" src="https://github.com/user-attachments/assets/a9db24ae-ad6e-422d-8aa9-f609fe548111" /> (I used Tri-hexagon sparse infill here because it makes the issue more obvious in a screenshot, but sparse infill pattern doesn't seem to affect the behavior.) ### Expected results Infill bridge support should be generated. <img width="1281" height="757" alt="Image" src="https://github.com/user-attachments/assets/c0c51b75-a7fd-4d27-a33d-3a4d95795d7d" /> ### Project file & Debug log uploads [No_internal_bridge_support.zip](https://github.com/user-attachments/files/24873164/No_internal_bridge_support.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? Issue exists for Concentric, Archimedean Chords, Hilbert Curves, and Octagram Spiral solid infill patterns.

MrUnknownDE closed this issue

2026-04-05 16:38:08 +02:00

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Reference: github/OrcaSlicer#963