wrong direction of outer walls on the inside of a hollow part #1375

New Issue

MrUnknownDE · 2026-04-05T17:30:36+02:00

MrUnknownDE commented

2026-04-05 17:30:36 +02:00

Originally created by @discip on 12/11/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

all

How to reproduce

I've long suspected that the inner walls of a mug (or similar object) should be printed in the opposite direction to the outer walls.

Yesterday, I found a case that proved this suspicion correct.

Actual results

Here is the situation:

wall direction on the outside (ccw)

wall direction on the inside (ccw)

wall direction on the inside (cw)

wall direction on the outside (ccw)

In this representative case, the direction of movement on outer walls of a part is consistent, whereas the direction of movement on the inner walls of a hollow part changes depending on whether there are holes in the wall or not.

Expected results

So, to ensure consistent wall direction throughout the entire part, the default direction of movement for inner walls of a hollow part needs to be opposite to the direction of movement on the corresponding outer walls of a part.

*Originally created by @discip on 12/11/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version all ### How to reproduce I've long suspected that the inner walls of a mug (or similar object) should be printed in the opposite direction to the outer walls. Yesterday, I found a case that proved this suspicion correct. ### Actual results Here is the situation: 1. wall direction on the outside (ccw) <img width="779" height="784" alt="Image" src="https://github.com/user-attachments/assets/2f3a5acf-e564-4725-b344-6ca8458d798a" /> 2. wall direction on the inside (ccw) <img width="779" height="784" alt="Image" src="https://github.com/user-attachments/assets/3c1f6850-ce77-41b4-a524-0e0c84845357" /> 3. wall direction on the inside (cw) <img width="779" height="784" alt="Image" src="https://github.com/user-attachments/assets/745a31b0-0b33-44d1-8ba6-a97389a58290" /> 4. wall direction on the outside (ccw) <img width="779" height="784" alt="Image" src="https://github.com/user-attachments/assets/aca8c8d1-d5cf-423c-aa0d-9e873b28c7d0" /> In this representative case, the direction of movement on outer walls of a part is consistent, whereas the direction of movement on the inner walls of a hollow part changes depending on whether there are holes in the wall or not. ### Expected results So, to ensure consistent wall direction throughout the entire part, the default direction of movement for inner walls of a hollow part needs to be opposite to the direction of movement on the corresponding outer walls of a part.

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Reference: github/OrcaSlicer#1375