Smooth coefficient not working all the time. Abrupt speed changes still exist

[goodman-capu]

Bambu Studio Version

1.9.5.51

Where is the application from?

Bambu Lab Official website

OS version

macOS 14.6

Additional system information

MacBook Pro, Apple M1 Pro chip

Printer

Bambulab A1

How to reproduce

• Use the 3mf file in https://forum.bambulab.com/t/holes-with-petg-hf/97727
• Set smooth coefficient to a very low value, like 0.1.
• Slice it.

Actual results

Some abrupt speed change on certain layers (not all) https://forum.bambulab.com/t/holes-with-petg-hf/97727/10

Expected results

Smooth speed change on all layers. (Since smooth coefficient is set)

Project file & Debug log uploads

joystick_mount_lower_adapter_v7.0_test_PSta_MBaPETGHF_N4.3mf.zip

Checklist of files to include

• [x] Log file
• [X] Project file

[goodman-capu]

This is a simpler 3mf file that demonstrates the same issue (credit to model author GuiltySpark343): joystick_mount_lower_adapter_v7.0_test2.3mf.zip

[QingZhangBambu]

yes. need to improve. thanks to report that.

[goodman-capu]

The same issue exists for 1.9.7.52 When can we expect a fix? This bug is destroying PETG-HF printing

Thanks

[GuiltySpark87]

I second this. Is there a rough estimate as to when we can expext a fix?

[fahaaaxiki]

@GuiltySpark87 @goodman-capu 1.10 Beta2 (https://github.com/bambulab/BambuStudio/releases/tag/v01.10.00.81) has updated preset and this problem (PETG HF) could be handled like pictures above.

[MartinChan3]

I print another one with orange Bambu PETG-HF in my A1(0.4 nozzle), Studio 1.10 Beta2 ( https://github.com/bambulab/BambuStudio/releases/tag/v01.10.00.81 )

[goodman-capu]

I print another one with orange Bambu PETG-HF in my A1(0.4 nozzle), Studio 1.10 Beta2 ( https://github.com/bambulab/BambuStudio/releases/tag/v01.10.00.81 )

Seems like the issue was not fixed :(