Sparse infill modifier generates random support that hugs walls instead of actually modifying sparse infill #1977

New Issue

MrUnknownDE · 2026-04-05T21:59:21+02:00

MrUnknownDE commented

2026-04-05 21:59:21 +02:00

Originally created by @Ten0 on 10/6/2025

OrcaSlicer Version

2.3.0

Operating System (OS)

Linux

OS Version

NixOS 25.05

Printer

Creality Ender 3 V3 KE

How to reproduce

Open the project file
Note how project settings are such that infill should be 25% everywhere
Except on the area that corresponds to the modifier cylinder where it should be 70%
Note how supports are only allowed on a very specific portion of the piece (the big overhang in the middle)
Slice

Actual results

Generates wierd extra supports, and does not respect infill setting change.

Removing the cylinder removes the weird extra support (but obviously does not apply the infill change I want).

Expected results

The portion of the object that intersects with the cylinder should have stronger infill.
There should be no random support material appearing.

Project file & Debug log uploads

box.zip

*Originally created by @Ten0 on 10/6/2025* ### OrcaSlicer Version 2.3.0 ### Operating System (OS) Linux ### OS Version [NixOS 25.05](https://search.nixos.org/packages?channel=25.05&show=orca-slicer&query=orca-slicer) ### Printer Creality Ender 3 V3 KE ### How to reproduce - Open the project file - Note how project settings are such that infill should be 25% everywhere - Except on the area that corresponds to the modifier cylinder where it should be 70% - Note how supports are only allowed on a very specific portion of the piece (the big overhang in the middle) - Slice <img width="3358" height="2020" alt="Image" src="https://github.com/user-attachments/assets/0f1be8ea-52d6-48dc-89fd-4adaf666d09f" /> ### Actual results Generates wierd extra supports, and does not respect infill setting change. <img width="3831" height="2010" alt="Image" src="https://github.com/user-attachments/assets/64be67f9-fb3c-44cf-af47-3a58cec6c409" /> <img width="3010" height="1714" alt="Image" src="https://github.com/user-attachments/assets/0519ac53-71bb-4a59-b444-9bd894e0f50e" /> Removing the cylinder removes the weird extra support (but obviously does not apply the infill change I want). ### Expected results The portion of the object that intersects with the cylinder should have stronger infill. There should be no random support material appearing. ### Project file & Debug log uploads [box.zip](https://github.com/user-attachments/files/22730652/box.zip)

MrUnknownDE closed this issue

2026-04-05 21:59:21 +02:00

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Reference: github/OrcaSlicer#1977