Variable support layer height is incompatible with tree supports #1761

New Issue

MrUnknownDE · 2026-04-05T19:40:03+02:00

MrUnknownDE commented

2026-04-05 19:40:03 +02:00

Originally created by @matthiasvonlieferando on 10/31/2025

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

Elegoo Centauri Carbon

How to reproduce

Import any model with an overhang larger than the set support threshold angle
Select tree supports
Enable variable support layer height
Set support top z distance to any value
Slice the model
Set color scheme in preview window to layer height

Actual results

The support layer height is exactly equal to the model layer height, top z distance is rounded to the nearest layer. This only occurs with organic tree supports, not slim, strong or hybrid.

Expected results

The support layers should be a different height than the model layers, additionally, the top z distance should be dynamic and not rounded to the nearest model layer height.

Project file & Debug log uploads

TreeSupportIssue.zip

Checklist of files to include

Log file
Project file

Anything else?

This is where the problem arises. Instead of expanding the gap by the expected half layer, a top z distance of 0.3mm expands it to 2 full layers.

This might be because the tree supports themselves are broken, or, much more likely, the independent support layer height is not functioning properly. This is more likely, due to the support layers all having the same layer height as the model, instead of being larger.

*Originally created by @matthiasvonlieferando on 10/31/2025* ### 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 Elegoo Centauri Carbon ### How to reproduce 1. Import any model with an overhang larger than the set support threshold angle 2. Select tree supports 3. Enable variable support layer height 4. Set support top z distance to any value 5. Slice the model 6. Set color scheme in preview window to layer height ### Actual results The support layer height is exactly equal to the model layer height, top z distance is rounded to the nearest layer. This only occurs with organic tree supports, not slim, strong or hybrid. ### Expected results The support layers should be a different height than the model layers, additionally, the top z distance should be dynamic and not rounded to the nearest model layer height. ### Project file & Debug log uploads [TreeSupportIssue.zip](https://github.com/user-attachments/files/23268199/TreeSupportIssue.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? <img width="753" height="1119" alt="Image" src="https://github.com/user-attachments/assets/eb989faa-2eb9-4170-a2f9-dc9e0b7b76d2" /> <img width="756" height="1204" alt="Image" src="https://github.com/user-attachments/assets/819a6d2b-b85a-410e-878b-06018df92a28" /> This is where the problem arises. Instead of expanding the gap by the expected half layer, a top z distance of 0.3mm expands it to 2 full layers. This might be because the tree supports themselves are broken, or, much more likely, the independent support layer height is not functioning properly. This is more likely, due to the support layers all having the same layer height as the model, instead of being larger. <img width="746" height="845" alt="Image" src="https://github.com/user-attachments/assets/1b5ab5e0-9f6a-4199-9c47-827af00d4cfc" />

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Reference: github/OrcaSlicer#1761