Improve seam quality by acceleration control #1832

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MrUnknownDE · 2026-04-05T20:18:51+02:00

MrUnknownDE commented

2026-04-05 20:18:51 +02:00

Originally created by @DImagine on 10/25/2025

Is there an existing issue for this feature request?

I have searched the existing issues

Add feature to control acceleration around the seam region.

Currently, the print quality near the seam can be noticeably affected by the acceleration used on the outer perimeter. Reducing the acceleration proved to have a significant effect on seam quality in my tests (see test images below).

It seems that pressure advance cannot compensate equally well for extreme deceleration and re-acceleration transitions at the points of full stoppage at the seams.

At the moment, achieving optimal seam quality requires lowering acceleration for the entire outer perimeter, which is inefficient.

Which printers will be beneficial to this feature?

All

Describe the solution you'd like

Add a feature to locally control acceleration around the seam region, with the control area centered at the seam point.

Optionally, make the region size adjustable.

Adding acceleration control around the seam would make it possible to preserve overall print speed while improving seam appearance and consistency. (BTW the existing Scarf Joint Speed feature did not noticeably improve quality in my case.)

Describe alternatives you've considered

No response

Additional context

The attached photos demonstrate prints where the settings differ only in outer perimeter acceleration:

1. 300 mm/s²
2. 2000 mm/s²
3. 4000 mm/s²

Sample No. 1 provides the best result (achieved after a full day of testing). I experimented with various settings (including Scarf Joint Speed and Extrusion Rate Smoothing), but reducing the acceleration proved to have the crucial effect on seam quality.

*Originally created by @DImagine on 10/25/2025* ### Is there an existing issue for this feature request? - [x] I have searched the existing issues ### Is your feature request related to a problem? Add feature to control acceleration around the seam region. Currently, the print quality near the seam can be noticeably affected by the acceleration used on the outer perimeter. Reducing the acceleration proved to have a significant effect on seam quality in my tests (see test images below). It seems that pressure advance cannot compensate equally well for extreme deceleration and re-acceleration transitions at the points of full stoppage at the seams. At the moment, achieving optimal seam quality requires lowering acceleration for the entire outer perimeter, which is inefficient. ### Which printers will be beneficial to this feature? All ### Describe the solution you'd like Add a feature to locally control acceleration around the seam region, with the control area centered at the seam point. Optionally, make the region size adjustable. Adding acceleration control around the seam would make it possible to preserve overall print speed while improving seam appearance and consistency. (BTW the existing Scarf Joint Speed feature did not noticeably improve quality in my case.) ### Describe alternatives you've considered _No response_ ### Additional context The attached photos demonstrate prints where the settings differ only in outer perimeter acceleration: 1. 300 mm/s² 2. 2000 mm/s² 3. 4000 mm/s² Sample No. 1 provides the best result (achieved after a full day of testing). I experimented with various settings (including Scarf Joint Speed and Extrusion Rate Smoothing), but reducing the acceleration proved to have the crucial effect on seam quality. <figure> <img width="500" height="489" alt="Seam quality comparison" src="https://github.com/user-attachments/assets/a85f8d7f-0876-4e49-b4f1-ecf6d6a265a5" /> </figure>

MrUnknownDE closed this issue

2026-04-05 20:18:51 +02:00

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Reference: github/OrcaSlicer#1832