Support generation fails for e.g. elevated circular cutouts when using "On build plate only" + "Support critical regions only" #1831

New Issue

MrUnknownDE · 2026-04-05T20:17:44+02:00

MrUnknownDE commented

2026-04-05 20:17:44 +02:00

Originally created by @SinglerGold2 on 10/25/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.2-dev Build ad0ed95

Operating System (OS)

Windows

OS Version

11 25h2

Additional system information

When slicing a model with elevated overhangs (e.g. a 120 mm fan hole several centimeters above the build plate), OrcaSlicer does not generate supports under the circular cutout if both of the following options are enabled:

Support on build plate only
Support critical regions only

Expected behavior:
Supports should be generated from the build plate up to the overhanging geometry (the fan hole), since it is a critical region that cannot be printed without support.

Actual behavior:
No supports are generated under the elevated cutout, resulting in unsupported perimeters and failed prints.

Printer

Centauri Carbon and Qidi X-Max3

How to reproduce

Load a model with a large circular cutout several cm above the build plate (e.g. a 120 mm fan hole in a flat plate).
Enable Supports.
Set Support on build plate only.
Set Support critical regions only.
Slice the model.

Actual results

The elevated cutout receives no support structures.

Expected results

Supports should be generated from the build plate to the cutout, since it is a critical overhang.

Project file & Debug log uploads

elevated_fan_hole.zip

Checklist of files to include

Log file
Project file

Anything else?

https://github.com/user-attachments/assets/49d815ff-b6ef-4172-93fe-d09e736cdad3

*Originally created by @SinglerGold2 on 10/25/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.2-dev Build ad0ed95 ### Operating System (OS) Windows ### OS Version 11 25h2 ### Additional system information When slicing a model with elevated overhangs (e.g. a 120 mm fan hole several centimeters above the build plate), OrcaSlicer does not generate supports under the circular cutout if both of the following options are enabled: - Support on build plate only - Support critical regions only Expected behavior: Supports should be generated from the build plate up to the overhanging geometry (the fan hole), since it is a critical region that cannot be printed without support. Actual behavior: No supports are generated under the elevated cutout, resulting in unsupported perimeters and failed prints. ### Printer Centauri Carbon and Qidi X-Max3 ### How to reproduce - Load a model with a large circular cutout several cm above the build plate (e.g. a 120 mm fan hole in a flat plate). - Enable Supports. - Set Support on build plate only. - Set Support critical regions only. - Slice the model. ### Actual results The elevated cutout receives no support structures. ### Expected results Supports should be generated from the build plate to the cutout, since it is a critical overhang. ### Project file & Debug log uploads [elevated_fan_hole.zip](https://github.com/user-attachments/files/23142287/elevated_fan_hole.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? https://github.com/user-attachments/assets/49d815ff-b6ef-4172-93fe-d09e736cdad3 <img width="2061" height="667" alt="Image" src="https://github.com/user-attachments/assets/f006db0d-1fa7-419f-b452-a0508faeb173" />

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Reference: github/OrcaSlicer#1831