Input Shaping evaluation help needed

[gringo]

Hey there,
Can someone explain to me which input shaper I should use and how I can get rid of the frequencies below 30Hz.

Or do I have a mechanical problem?

Thanks all

[droftarts]

@gringo Some context would be useful. I'm guessing this is a delta machine? Looks like ZVDDD is doing a good job of removing a major resonant frequency across all the axes. Probably just the natural harmonic of your machine, as it's seen on all axes at a specific frequency, so not a mechanical problem. But I'm not an expert on IS!

Ian

[gringo]

My Printer is a Core XY

[gringo]

I have another question.
Where can I adjust speeds and acceleration for Input Shaping?
Imthink different speeds and accelerations needs different Input Shaper frequencies.

[dc42]

@gringo the frequencies below 30Hz may be artefacts from the movement you are using when you capture the data. Try capturing data after the movement has stopped, by unchecking the box that says capture data over the whole move.

[gringo]

@dc42

thanks, I will try it and post the results.

But which speeds and accelerations are used for Input Shaping?

[gringo]

Here are the next measurements

What now? I don't know what to set.

[gringo]

Here is a photo from a actual print.
Tested different Shaper, started with ei2@56Hz --> zvddd@57Hz --> zvddd@80Hz.

I can´t see any difference.

[ctilley79]

@gringo those are short segments where input shaping is not being applied. 3.5 RC1 attempted to fix that but I’ve found that there are still moves where input shaping is ignored. My understanding is RRF’s input shaping may receive another overhaul after 3.5 is released.

For that reason I installed klipper on my duet boards and can confirm klipper does not have the same limitations. I look forward to coming back to RRF because overall, I do love RRF much better and the hardware is just much higher quality. My goal however is to print faster without the reduction in quality, and right now klipper provides that with exceptional results.

[gringo]

Thank you for the execution,

I have two other printers with Duet Boards where I print slower and with much less acceleration.

I have not tested Klipper yet, but I am planning to build the next printer and run it with Klipper to have a comparison.

I printed the VZ Cupe at 100mm/s with 5K ACC of the outer perimeter.
Reducing the acceleration of the outer perimeter to 2K at 100mm/s has brought significant improvement.

In my opinion, I should also be able to select the speed and acceleration in the selection window for Input Shaper as the frequencies change at different speeds and accelerations.