Double peak in both X and Y
I am watching this video and he mentioned that double peaks might mean loose bolt?https://www.youtube.com/watch?v=M-yc_XM8sP4
But i have tightened everything on my carriage.
Adxl is on ebb36 toolboard which is mounted to the back of my vz-hextrudort, seems rigid to me
3D Printers & a Whiteboard
YouTube
How to Read and Analyze Input Shaper Graphs Generated by Klipper
This video is supposed to be a brief overview on what the input shaper graphs can tell us. It is the first video of a series of videos which will give a more in depth view on the kinematic system and input shaping in Klipper.
As always: feel free to jump to those parts, that help you with your problems:
00:00 Intro
00:57 What we can learn from...
3 Replies
Especially on the X axis you see not just two peaks, but a lot of resonance on a lot of frequencies. That might actually mean issues with the wire loom, that it is too loose and resonating with everything. It might also mean that your belts are on the loose side.
thanks for the reply. I am new to reading these graphs. How do you see "a lot of resonance on alot of frequencies". Is it from the wide peaks instead of thin narrow ones?
Reading these graphs is relatively simple. Horizontally you have the frequencies and vertically you have the resonance for each frequency. Ideally you want a graph with a single peak, with no "side peaks" before the resonance going to zero.
In practice you will always also see some resonance around 125 Hz, which is from printer design (can't really be avoided).
So looking at your graphs, you don't just see a second peak (which might indicate a loose bolt indeed) but also several "side peaks" and the graph never going to (relative to the largest peaks) zero before 125 Hz.
That basically means that a lot of things are resonating. That could indicate that your wire loom is pulling a lot on the ADXL or X carriage during movements.
What helped me a lot during tuning is the resonance holder klipper plugin ( https://gist.github.com/kmobs/f6def5db272ca5c1b81727482f53bed8) that allows you to let your printer hold a certain frequency for a longer period of time. You can then hear and feel around for what is resonating at that frequency. That gives you an indication of what you can fix.