Marlin [FR] Input Shaper disabled at slower speed

Is your feature request related to a problem? Please describe.

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Describe the feature you want

I have been playing with Input shaping trying to get it dialed. I am getting close to a good speed/accel freq settings and was curious how difficult it would be to add a cut off point for input shaping as it relates to speed. the idea is, I can print most everything fast with input shaping, but adjust the speed for the outer layer to a much lower speed for better quality. can we set a variable for speed that if the speed is below a specified value, it will disable input shaping for that outer layer. It seems as though input shaping does not adjust with speed so I am getting induced ghosting from input shaper over compensating when running and much slower speeds.

Additional context

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Nov 29 '23 18:11 tklus

Input shaping should not create artifacts when printing slower, as long as it is tuned correctly. At least I never noticed any on my machine and I've been printing a lot at 10 - 15 mm/s recently due to testing a 1 mm nozzle.

Apart from that, I don't think the option to turn off IS for lower speeds could be implemented in any reasonable form, since sections of a print which will always be slow - such as sharp corners - are the sections where you want to use input shaping, if is is enabled. Therefore, a speed threshold would effectively cripple the feature.

If you have trouble with specific designs, you can always turn off IS using M593 F0. Or you can use a post processing macro to disable/enable it before and after a layer or maybe even before/after just the outer perimeters, but that may be a bit cumbersome to implement.

Dec 18 '23 13:12 XDA-Bam

Input Shaping's effect decreases with speed. It should not be introducing artifacts at lower speeds. Do you have a replicable example of this happening with IS?