Pressure_advance_smooth_time on direct extruders with short filament path

[1999]

@dmbutyugin

Are you using input shaping by any chance? If yes, what are the parameters of the input shaper that you are using? And what was the ‘optimal’ PA value that you’ve got (and what extruder / filament type)?

I was using input shaper, mzv at 54Hz. I just did another test with input shaper turned off, and I still see the gap between PA undercompensating and overcompensating. It may be due to the fact that the test acceleration is much below the input shaper smoothing limit. I have not done a side-by-side comparison with shaper turned on and off for the same PA. My current test with a PETG filament on direct drive shows best result at 0.082 and smooth_time 0.02

@dmbutyugin

Klipper in fact slows down the toolhead at acute corners, and the maximum acceleration is also respected.

I see, I misunderstood how scv works. I need to look at it in more detail.