Walls printing order does not account for bridges, will print inner area of bridge in midair #1908

New Issue

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

MrUnknownDE commented

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

Originally created by @evelant on 10/15/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1

Operating System (OS)

macOS

OS Version

26.0.1

Additional system information

N/A

Printer

Customized Anet A8

How to reproduce

On a model with bridges that intersect at right angles
Set "External Bridge Infill Direction" to 90 degrees (otherwise shorter bridge segment is printed unachored on one end as a "zig-zag")
Set "Walls printing order" to inner-outer or inner-outer-inner
Observe per the image below, the "inner" bridge wall is printed first in midair with nothing to anchor it

Actual results

"inner" bridge walls are printed first in midair with nothing to anchor it

Expected results

Bridges should ignore wall order and always print in the direction of the two closest anchor points

Project file & Debug log uploads

files_project_logs.zip

Checklist of files to include

Log file
Project file

Anything else?

If wall order is changed out outer-inner the ordering of the bridge lines is better, but still not ideal, it prints bridges with 45 degree angles.

Without setting bridge infill direction to 90 degrees it will print the two "short" bridges (closest to center) first in a zig-zag pattern with no anchor on the other end so they become spaghetti.

Ideally it would consider this model as having two independent bridges with the longer ones being printed first so they can anchor the shorter ones. Currently there appears to be no way to make that happen. Or perhaps more simply always print bridges that have anchors first in case they might become anchors for other bridges.

*Originally created by @evelant on 10/15/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 ### Operating System (OS) macOS ### OS Version 26.0.1 ### Additional system information N/A ### Printer Customized Anet A8 ### How to reproduce 1. On a model with bridges that intersect at right angles 2. Set "External Bridge Infill Direction" to 90 degrees (otherwise shorter bridge segment is printed unachored on one end as a "zig-zag") 3. Set "Walls printing order" to inner-outer or inner-outer-inner 4. Observe per the image below, the "inner" bridge wall is printed first in midair with nothing to anchor it <img width="665" height="675" alt="Image" src="https://github.com/user-attachments/assets/3a85565c-05f3-41ef-90e4-80d583b77094" /> ### Actual results "inner" bridge walls are printed first in midair with nothing to anchor it ### Expected results Bridges should ignore wall order and always print in the direction of the two closest anchor points ### Project file & Debug log uploads [files_project_logs.zip](https://github.com/user-attachments/files/22933203/files_project_logs.zip) ### Checklist of files to include - [x] Log file - [x] Project file ### Anything else? If wall order is changed out outer-inner the ordering of the bridge lines is better, but still not ideal, it prints bridges with 45 degree angles. Without setting bridge infill direction to 90 degrees it will print the two "short" bridges (closest to center) first in a zig-zag pattern with no anchor on the other end so they become spaghetti. Ideally it would consider this model as having two independent bridges with the longer ones being printed first so they can anchor the shorter ones. Currently there appears to be no way to make that happen. Or perhaps more simply always print bridges that have anchors first in case they might become anchors for other bridges.

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Reference: github/OrcaSlicer#1908