Infill pattern affects slicing even when Infill Density is set to 0% (Lightning Infill) #1083

New Issue

MrUnknownDE · 2026-04-05T16:47:14+02:00

MrUnknownDE commented

2026-04-05 16:47:14 +02:00

Originally created by @Mofuka on 1/14/2026

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

Windows11

Additional system information

No response

Printer

BambuLab A1

How to reproduce

Even when Infill Density is set to 0%, the selected Infill Pattern still affects the slicing results.

Specifically, when the Infill Pattern is set to 'Lightning' with 0% density, the slicer generates "support bridges" in mid-air (as shown in the attached image).

However, if I switch to a different Infill Pattern while keeping the density at 0%, the slicing result changes and those bridges are no longer generated (or generated correctly).

This suggests that the slicing engine might be referencing the Infill Pattern logic without first verifying if the Infill Density is greater than 0%.

It seems there is a code path that invokes pattern-specific behavior regardless of the density setting.

Actual results

s

Expected results

s

Project file & Debug log uploads

bug.zip
log.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @Mofuka on 1/14/2026* ### 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 Windows11 ### Additional system information _No response_ ### Printer BambuLab A1 ### How to reproduce ![Image](https://github.com/user-attachments/assets/cb57a55e-4149-4e06-aa97-b2ff07b83ba8) Even when Infill Density is set to 0%, the selected Infill Pattern still affects the slicing results. Specifically, when the Infill Pattern is set to 'Lightning' with 0% density, the slicer generates "support bridges" in mid-air (as shown in the attached image). However, if I switch to a different Infill Pattern while keeping the density at 0%, the slicing result changes and those bridges are no longer generated (or generated correctly). This suggests that the slicing engine might be referencing the Infill Pattern logic without first verifying if the Infill Density is greater than 0%. It seems there is a code path that invokes pattern-specific behavior regardless of the density setting. ### Actual results s ### Expected results s ### Project file & Debug log uploads [bug.zip](https://github.com/user-attachments/files/24609077/bug.zip) [log.zip](https://github.com/user-attachments/files/24609078/log.zip) ### Checklist of files to include - [x] Log file - [x] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#1083