#Random layer shifts and shaketune mechanical issue

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mystic pine
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I have a formbot 2.4 pro kit. I am experiencing random layer shifts (at least I think it is). It does not happen all the time, height and position.
Auto Speed script gives more acceleration and speed than what I'm using. I'm being super conservative on speed and acceleration.

I used shaketune BELTS_SHAPER_CALIBRATION and the result was the following: Belts estimated similarity: 79.5%
[experimental] Mechanical Health Indicator: potential signs of a mechanical issue (55.6%)

During 40Hz testing I hear some metal vibrating but I can't figure out where it comes from. I think its inside stealthburner but shouldn't be related to the problem. SB stays firmly when I try to move it by hand. I'm rebuilding it soon anyways.

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Based on the graph I think I need to tighten both belts since magnitude is small