Extraneous support created for small complex models, even with "Remove small overhangs" #1421

New Issue

MrUnknownDE · 2026-04-05T17:40:38+02:00

MrUnknownDE commented

2026-04-05 17:40:38 +02:00

Originally created by @ASavchenkov on 12/4/2025

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

ELEGOO Centauri Carbon

How to reproduce

With the attached project file:

Press slice and view the top of the sliced miniature.

To recreate the project file from scratch:

Download miniatures.
Load "reclaimer_8.stl" onto the build plate.
Use [Elegoo Centauri Carbon 0.2 nozzle], with [Elegoo PLA], and the [0.08mm Optimal] profile.
[Enable Support] [Style: Snug]

Actual results

There are numerous small chunks of support interface that are in many cases printing in thin air.

I have seen more egregious support interface for other miniatures, but those are not free, so I don't believe I can upload those. I will still add screenshots though.

Overhangs as shown by support painter.

Supports Sliced

Expected results

One would expect supports to be generated only for the regular size overhangs (however it is Orca defines "small"), and only in cases where it would be of help. Below is a side by side comparison, with he left being what I would expect, achieved by manual support painting, and the right being the current behavior.

Project file & Debug log uploads

Side By Side.zip

Checklist of files to include

Log file
Project file

Anything else?

It's also not clear to me what exactly "remove small overhangs" does. That setting doesn't seem to affect support generation at all. It seems like it should be marking overhangs of just a layer or two as not requiring support, but the documentation is quite sparse on the matter, and I am not familiar enough with this code-base to figure out how the support generation actually interacts with this setting.

*Originally created by @ASavchenkov on 12/4/2025* ### 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 ELEGOO Centauri Carbon ### How to reproduce With the attached project file: 1. Press slice and view the top of the sliced miniature. To recreate the project file from scratch: 1. Download [miniatures](https://www.myminifactory.com/object/3d-print-full-spectrum-dominance-2023-sample-models-335807). 2. Load "reclaimer_8.stl" onto the build plate. 3. Use [Elegoo Centauri Carbon 0.2 nozzle], with [Elegoo PLA], and the [0.08mm Optimal] profile. 4. [Enable Support] [Style: Snug] ### Actual results There are numerous small chunks of support interface that are in many cases printing in thin air. <img width="1268" height="756" alt="Image" src="https://github.com/user-attachments/assets/1e8ab1f0-67f9-43c7-a26c-2010d62eff45" /> I have seen more egregious support interface for other miniatures, but those are not free, so I don't believe I can upload those. I will still add screenshots though. **Overhangs as shown by support painter.** <img width="847" height="1308" alt="Image" src="https://github.com/user-attachments/assets/2ae9bf9b-f89c-4e09-bf74-0cde05ce401d" /> **Supports Sliced** <img width="1265" height="911" alt="Image" src="https://github.com/user-attachments/assets/0a81bf77-5dbb-46cd-a7c1-28d468252a4e" /> ### Expected results One would expect supports to be generated only for the regular size overhangs (however it is Orca defines "small"), and only in cases where it would be of help. Below is a side by side comparison, with he left being what I would expect, achieved by manual support painting, and the right being the current behavior. <img width="731" height="575" alt="Image" src="https://github.com/user-attachments/assets/dbd53193-2fda-4cb8-a48c-19c1e3c3f626" /> ### Project file & Debug log uploads [Side By Side.zip](https://github.com/user-attachments/files/23940061/Side.By.Side.zip) ### Checklist of files to include - [x] Log file - [x] Project file ### Anything else? It's also not clear to me what exactly "remove small overhangs" does. That setting doesn't seem to affect support generation at all. It seems like it _should_ be marking overhangs of just a layer or two as not requiring support, but the documentation is quite sparse on the matter, and I am not familiar enough with this code-base to figure out how the support generation actually interacts with this setting.

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Reference: github/OrcaSlicer#1421