Toolhead clicking sound

So - after some time investigating this and fixing quite some errors on the way - they don't seem to be the one i am actually looking for.
Maybe somebody recognises this clicking sound and is able to tell me where the heck this is coming from, because i sure as hell am not able to pinpoint this sadpepe

i thought for a long time this is the nozzle rubbing over infill lines and "flipping" them for this sound...
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