bridging not working for blind hole that touches inner wall area #1887

New Issue

MrUnknownDE · 2026-04-05T20:53:35+02:00

MrUnknownDE commented

2026-04-05 20:53:35 +02:00

Originally created by @adiekwisch on 10/17/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1

Operating System (OS)

Linux

OS Version

Fedora 42

Additional system information

No response

Printer

Bambu Lab X1 Carbon

How to reproduce

Create Cylinder with blind hole in bottom surface (I have attached a project with the model I used for testing).
Set Wall Loops to a high number, so that part or all of the inner wall area on top of the hole is over the hole.
Slice and observe that parts of the inner wall will be printed in the air. A bridge will be generated only after the requested amount of walls have been created. Note that the slicer still marks the problematic walls as overhangs.

PS: "Bridge counterbore holes -> Partially Bridged" settings sometimes resolves the issue (although this is not a counterbore). When the outer wall of the cylinder is thin though the whole layer becomes a bridge with no outer wall at all (which might also be a bug?).

Actual results

before bridge layer

bridge layer

after bridge layer

Expected results

The hole should be bridged properly. The bridge should probably take precedence over the inner walls.

Project file & Debug log uploads

hole_bridge_test.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @adiekwisch on 10/17/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 ### Operating System (OS) Linux ### OS Version Fedora 42 ### Additional system information _No response_ ### Printer Bambu Lab X1 Carbon ### How to reproduce 1. Create Cylinder with blind hole in bottom surface (I have attached a project with the model I used for testing). 2. Set Wall Loops to a high number, so that part or all of the inner wall area on top of the hole is over the hole. 3. Slice and observe that parts of the inner wall will be printed in the air. A bridge will be generated only after the requested amount of walls have been created. Note that the slicer still marks the problematic walls as overhangs. PS: "Bridge counterbore holes -> Partially Bridged" settings sometimes resolves the issue (although this is not a counterbore). When the outer wall of the cylinder is thin though the whole layer becomes a bridge with no outer wall at all (which might also be a bug?). ### Actual results before bridge layer <img width="566" height="652" alt="Image" src="https://github.com/user-attachments/assets/1589e106-c03e-41f0-b0ba-056206eeab2b" /> bridge layer <img width="566" height="652" alt="Image" src="https://github.com/user-attachments/assets/c0f4576d-0c8e-434f-ace1-6e9d350a391d" /> after bridge layer <img width="566" height="652" alt="Image" src="https://github.com/user-attachments/assets/678cc75a-02ac-4eda-b82f-667c266c6b07" /> ### Expected results The hole should be bridged properly. The bridge should probably take precedence over the inner walls. ### Project file & Debug log uploads [hole_bridge_test.zip](https://github.com/user-attachments/files/22980242/hole_bridge_test.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#1887