Support not generated under sharp corners & Brim on layer 2 #2421

New Issue

MrUnknownDE · 2026-04-06T06:47:14+02:00

MrUnknownDE commented

2026-04-06 06:47:14 +02:00

Originally created by @galaxyman7 on 8/20/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.0

Operating System (OS)

Windows

OS Version

Windows 11

Additional system information

No response

Printer

QIDI Plus 4

How to reproduce

Slice an object with sharp corners, tilted at 45 degrees. Use manual tree supports and paint onto corner facing bed. Use automatic brim. Use no interface layers (no interface layers just makes the problem worse. It still happens when using interface layers too). See attached file.

Actual results

Support is generated around the corner, but not under it. The corner has nothing to stick to and makes a mess.
Also, I noticed the brim is generated on layer 2 instead of layer 1, which is a separate bug that I haven't looked into yet.

Expected results

Support should be generated directly below the first layer of the corner, offset by the top Z distance, and then wrap around it.
The brim should be generated on layer 1 instead of printing a stringy brim in mid air on layer 2.

Project file & Debug log uploads

support corner issue.zip

Checklist of files to include

Log file
Project file

Anything else?

Object geometry:

Painted on supports

Layer when corner starts printing

Layer before corner starts printing (gap where there should be support)

Brim printed on layer 2:

First layer:

*Originally created by @galaxyman7 on 8/20/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.0 ### Operating System (OS) Windows ### OS Version Windows 11 ### Additional system information _No response_ ### Printer QIDI Plus 4 ### How to reproduce Slice an object with sharp corners, tilted at 45 degrees. Use manual tree supports and paint onto corner facing bed. Use automatic brim. Use no interface layers (no interface layers just makes the problem worse. It still happens when using interface layers too). See attached file. ### Actual results Support is generated around the corner, but not under it. The corner has nothing to stick to and makes a mess. Also, I noticed the brim is generated on layer 2 instead of layer 1, which is a separate bug that I haven't looked into yet. ### Expected results Support should be generated directly below the first layer of the corner, offset by the top Z distance, and then wrap around it. The brim should be generated on layer 1 instead of printing a stringy brim in mid air on layer 2. ### Project file & Debug log uploads [support corner issue.zip](https://github.com/user-attachments/files/21899465/support.corner.issue.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? Object geometry: <img width="938" height="804" alt="Image" src="https://github.com/user-attachments/assets/9d8d5b81-a2f0-45dc-a112-8d04852f26e5" /> Painted on supports <img width="1008" height="766" alt="Image" src="https://github.com/user-attachments/assets/0a5ba06f-8ee1-4014-86cb-b24f80231449" /> Layer when corner starts printing <img width="760" height="1050" alt="Image" src="https://github.com/user-attachments/assets/c8438391-17e4-4a51-9b88-5870f1a11dad" /> Layer before corner starts printing (gap where there should be support) <img width="863" height="819" alt="Image" src="https://github.com/user-attachments/assets/f4a6180a-42a7-4adb-8cb9-db387d234c26" /> Brim printed on layer 2: <img width="1063" height="826" alt="Image" src="https://github.com/user-attachments/assets/d9e90e02-39ee-48b2-8376-2fbcf03e7e72" /> First layer: <img width="1052" height="819" alt="Image" src="https://github.com/user-attachments/assets/c8b56f4c-68ac-4a76-a0eb-b8891d869af3" />

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Reference: github/OrcaSlicer#2421