Feature/slow_down_before_seam #1886

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MrUnknownDE · 2026-04-05T20:53:35+02:00

MrUnknownDE commented

2026-04-05 20:53:35 +02:00

Originally created by @Azio-Pantheon on 10/17/2025

Description

In short, slowing down before the seam helps releasing the pressure in the nozzle and improving the seam quality. Usually the seam looks the worst after printing solid infill and/or printing at high speed(lots of pressure build up).
Here is a good explaination I found from #4264.@HakunMatat4 had the right idea, but this feature specifically target the seam and does it better than the current pressure equalizer.

Here is the test result printing the same stick, without this feature; with 30mm slow down to 10mm/s; and with 200mm slow down to 10mm/s

Screenshots/Recordings/Graphs

I implemented it as part of extrusion rate smooting, so we have to turn on extrusion rate smoothing to use it. Set it to 1000 mm3/s2(basically disabling it without turning it off). Then you can set the slow down speed and slow down distance.

Tests

The initial results look promising.

This is a feature requested by my colleague and I implemented it for our fork of orcaslicer. We will continue to test this internally for our printers. Just putting it out here so anyone can try it

*Originally created by @Azio-Pantheon on 10/17/2025* # Description In short, slowing down before the seam helps releasing the pressure in the nozzle and improving the seam quality. Usually the seam looks the worst after printing solid infill and/or printing at high speed(lots of pressure build up). Here is a good explaination I found from #4264.@HakunMatat4 had the right idea, but this feature specifically target the seam and does it better than the current pressure equalizer. <img width="983" height="632" alt="Screenshot 2025-10-17 160053" src="https://github.com/user-attachments/assets/006019e3-651d-4a56-add7-e29be17fdf3b" /> Here is the test result printing the same stick, without this feature; with 30mm slow down to 10mm/s; and with 200mm slow down to 10mm/s <img width="1643" height="467" alt="Screenshot 2025-10-17 161343" src="https://github.com/user-attachments/assets/34438a61-739e-413c-b5c7-6e8883310236" /> ![IMG_3936](https://github.com/user-attachments/assets/43b6c921-5273-4cd7-a1c4-bc3d3bfbcba7) ![IMG_3937](https://github.com/user-attachments/assets/8a6a8386-227e-4036-9d1d-63a76cf925e5) ![IMG_3941](https://github.com/user-attachments/assets/1b59fb23-d596-4b50-bb63-f92c260a5b63) # Screenshots/Recordings/Graphs I implemented it as part of extrusion rate smooting, so we have to turn on extrusion rate smoothing to use it. Set it to 1000 mm3/s2(basically disabling it without turning it off). Then you can set the slow down speed and slow down distance. <img width="344" height="280" alt="Screenshot 2025-10-17 162011" src="https://github.com/user-attachments/assets/21ded282-3be6-4b4e-88d4-627e889f02a7" /> ## Tests The initial results look promising. This is a feature requested by my colleague and I implemented it for our fork of orcaslicer. We will continue to test this internally for our printers. Just putting it out here so anyone can try it

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Reference: github/OrcaSlicer#1886