Scarf joint seam for inner walls has missalined scarf start/end #1777

New Issue

MrUnknownDE · 2026-04-05T19:49:50+02:00

MrUnknownDE commented

2026-04-05 19:49:50 +02:00

Originally created by @314159-r on 10/29/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1 AppImage

Operating System (OS)

Linux

OS Version

Xubuntu 24.04

Additional system information

No response

Printer

Creality K1

How to reproduce

Add a primitive cylinder object.
Set Scarf joint seam to Contour or Contour and hole.
Deselect: Scarf around entire wall.
Select: Scarf joint for inner walls
Slice...

Actual results

When using a specified scarf length (not around entire wall), the scarf length in the beginning of inner wall lines, only become half of the specified length.
However, the scarf length in the end of the same line become as specified, making the overlap of the scarf in the beginning of the line incomplete.
This mismatch results in an underextrusion of 50% at the center of the scarf joint.

Img. 1: Inner wall line start, and scarf start at arrow 2 (but should have started at arrow 1).
Img. 2: Inner wall half way. Scarf completed at arrow 3.
img. 3: inner wall line ending scarf is started at arrow 1.
img 4: inner wall line complete at arrow 3.

The outer wall behaves as expected. The scarfs start at arrow 1 and ends at arrow 3.
Also using scarf around entire wall behaves as expected for both inner and outer walls.

Expected results

The scarf length in the beginning and in the end of a line must be equal.

Project file & Debug log uploads

Cylinder.3mf.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @314159-r on 10/29/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 AppImage ### Operating System (OS) Linux ### OS Version Xubuntu 24.04 ### Additional system information _No response_ ### Printer Creality K1 ### How to reproduce 1. Add a primitive cylinder object. 2. Set `Scarf joint seam` to `Contour` or `Contour and hole`. 3. Deselect: `Scarf around entire wall`. 4. Select: `Scarf joint for inner walls` 5. Slice... <img width="508" height="556" alt="Image" src="https://github.com/user-attachments/assets/0317dc77-b8db-4c2b-91ae-2267a3230929" /> ### Actual results When using a specified scarf length (not around entire wall), the scarf length in the beginning of inner wall lines, only become half of the specified length. However, the scarf length in the end of the same line become as specified, making the overlap of the scarf in the beginning of the line incomplete. This mismatch results in an underextrusion of 50% at the center of the scarf joint. Img. 1: Inner wall line start, and scarf start at arrow 2 (but should have started at arrow 1). Img. 2: Inner wall half way. Scarf completed at arrow 3. img. 3: inner wall line ending scarf is started at arrow 1. img 4: inner wall line complete at arrow 3. <img width="800" height="780" alt="Image" src="https://github.com/user-attachments/assets/01dafde9-ceec-4723-b6cd-4a1c21c8b9f1" /> <img width="800" height="780" alt="Image" src="https://github.com/user-attachments/assets/3195e7fe-6516-42f4-ae2b-f59533b5d3da" /> <img width="800" height="780" alt="Image" src="https://github.com/user-attachments/assets/c85f6cae-6d02-49a8-9190-545ebaa27490" /> <img width="800" height="780" alt="Image" src="https://github.com/user-attachments/assets/24b7af61-a793-4a33-b049-0398dbcca5d5" /> The outer wall behaves as expected. The scarfs start at arrow 1 and ends at arrow 3. Also using scarf around entire wall behaves as expected for both inner and outer walls. ### Expected results The scarf length in the beginning and in the end of a line must be equal. ### Project file & Debug log uploads [Cylinder.3mf.zip](https://github.com/user-attachments/files/23219709/Cylinder.3mf.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#1777