Extrusion rate smoothing and scarf seams produce 1mm/s moves. #2028

New Issue

MrUnknownDE · 2026-04-05T22:41:48+02:00

MrUnknownDE commented

2026-04-05 22:41:48 +02:00

Originally created by @Contomo on 10/1/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1-beta

Operating System (OS)

Windows

OS Version

Win 11

Additional system information

No response

Printer

Voron 2.4

How to reproduce

Enable scarf seams, set length to 999 or turn on around entire wall
enable extrusion rate smoothing (ive set mine to 350mm³/s²)
Slice models (benchy shows the issue a bit, becomes more apparent in flatter models)

Actual results

Slowdown bottom right

Closeup with speed 1	Closeup of the image above

Expected results

Results with no extrusion rate smoothing

Project file & Debug log uploads

Platewithproblems.zip

Checklist of files to include

Log file
Project file

Anything else?

Issue 7326 and/or 7078 may be related. but unsure as im not having any issues with the actual flowrate, and in that issue it doesnt seem to correlate with extrusion rate smoothing.

Ive attatched the project file (i hope it is the project file)

*Originally created by @Contomo on 10/1/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1-beta ### Operating System (OS) Windows ### OS Version Win 11 ### Additional system information _No response_ ### Printer Voron 2.4 ### How to reproduce 1. Enable scarf seams, set length to 999 or turn on around entire wall 2. enable extrusion rate smoothing (ive set mine to 350mm³/s²) 2. Slice models (benchy shows the issue a bit, becomes more apparent in flatter models) ### Actual results <table> <tr> <th align="center">Slowdown bottom right</th> </tr> <tr> <td width="50%"> <a href="https://github.com/user-attachments/assets/efff5435-8dfe-4cf8-b586-7f3673aef4ad"> <img src="https://github.com/user-attachments/assets/efff5435-8dfe-4cf8-b586-7f3673aef4ad" alt="Preview 1" width="100%"> </a> </tr> </table> <table> <tr> <th align="center">Closeup with speed 1</th> <th align="center">Closeup of the image above</th> </tr> <tr> <td width="50%"> <a href="https://github.com/user-attachments/assets/fa83a59c-0978-4bed-ac3e-94ae961ceaef"> <img src="https://github.com/user-attachments/assets/fa83a59c-0978-4bed-ac3e-94ae961ceaef" alt="Preview 1" width="100%"> </a> </td> <td width="50%"> <a href="https://github.com/user-attachments/assets/cff74a26-941a-4b4a-8731-6226e7593a9c"> <img src="https://github.com/user-attachments/assets/cff74a26-941a-4b4a-8731-6226e7593a9c" alt="Preview 2" width="100%"> </a> </td> </tr> </table> ### Expected results ### Results with no extrusion rate smoothing <img width="1249" height="679" alt="Image" src="https://github.com/user-attachments/assets/ba632c03-317e-4f0e-964b-07522610072c" /> ### Project file & Debug log uploads [Platewithproblems.zip](https://github.com/user-attachments/files/22644331/Platewithproblems.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? Issue [7326](https://github.com/SoftFever/OrcaSlicer/issues/7326) and/or [7078](https://github.com/SoftFever/OrcaSlicer/issues/7078) may be related. but unsure as im not having any issues with the actual flowrate, and in that issue it doesnt seem to correlate with extrusion rate smoothing. Ive attatched the project file (i hope it is the project file)

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Reference: github/OrcaSlicer#2028