"Bridge Counterbore Holes" - "sacrificial layer" does not detected all holes, but "Partially bridged" does #2280

New Issue

MrUnknownDE · 2026-04-06T03:07:16+02:00

MrUnknownDE commented

2026-04-06 03:07:16 +02:00

Originally created by @ElEsido on 9/5/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1 - alpha

Operating System (OS)

Windows

OS Version

Win 10

Additional system information

CPU: Amd Ryzen 5 3600
Memory: 16GB

Printer

Bambulab P1S

How to reproduce

Open a part with counterbore holes.
Under "Support" disable supports.
Under "Quality - Bridging - Bridge Counterbore Hole" choose "Partially Bridged" and slice. Observe that all counterbore holes are detected and partially bridged.
Now in the same setting choose "Sacrificial layer" and slice. Observe that NOT all counterbore holes are detected and given a sacrificial layer.
rotate part, slice again with setting "Sacrificial Layer" - repeat a couple of times. Observe that the number of identified counterbore holes changes.

Actual results

Option "Partially Bridged", all holes detected and partially bridged.

Option "Sacrificial Layer", one counterbore hole is detected and has a sacrificial layer

Part rotated, option "Sacrificial Layer", two counterbore holes are detected and have a sacrificial layer, two are not detected and the hole is printed in free air.

Further rotating results in 0-3 holes being detected, but never all 4.

Expected results

When choosing "Sacrificial Layer" all counterbore holes should be detected all the time, just like when choosing "Partially Bridged".

Project file & Debug log uploads

CounterboreHoles.zip

log.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @ElEsido on 9/5/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 - alpha ### Operating System (OS) Windows ### OS Version Win 10 ### Additional system information CPU: Amd Ryzen 5 3600 Memory: 16GB ### Printer Bambulab P1S ### How to reproduce 1. Open a part with counterbore holes. 2. Under "Support" disable supports. 3. Under "Quality - Bridging - Bridge Counterbore Hole" choose "Partially Bridged" and slice. Observe that all counterbore holes are detected and partially bridged. 4. Now in the same setting choose "Sacrificial layer" and slice. Observe that NOT all counterbore holes are detected and given a sacrificial layer. 5. rotate part, slice again with setting "Sacrificial Layer" - repeat a couple of times. Observe that the number of identified counterbore holes changes. ### Actual results Option "Partially Bridged", all holes detected and partially bridged. ![Image](https://github.com/user-attachments/assets/a6961549-efd0-4d72-93c6-b759f1aad1d7) Option "Sacrificial Layer", one counterbore hole is detected and has a sacrificial layer ![Image](https://github.com/user-attachments/assets/17a759ae-69b8-44aa-aa3a-e8c6938e0281) Part rotated, option "Sacrificial Layer", two counterbore holes are detected and have a sacrificial layer, two are not detected and the hole is printed in free air. ![Image](https://github.com/user-attachments/assets/1062cb22-8128-4584-803d-b64022da9def) Further rotating results in 0-3 holes being detected, but never all 4. ### Expected results When choosing "Sacrificial Layer" all counterbore holes should be detected all the time, just like when choosing "Partially Bridged". ### Project file & Debug log uploads [CounterboreHoles.zip](https://github.com/user-attachments/files/22166190/CounterboreHoles.zip) [log.zip](https://github.com/user-attachments/files/22166206/log.zip) ### Checklist of files to include - [x] Log file - [x] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#2280