ADD: Or is this a case of the nozzle getting looes and unscrewing itself? I am starting to find very tiny traces of burned PTFE leaking between the aluminium heater block and the nozzle...
Are you sure this is not leaking? My leaks were usually dark brown/black, I think PLA once it sits around a bit, as in a leak, burns a little.
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Or maybe your z-endstop is pushed up a little bit when homing your z-axis.
Thus after each homing, the endstop triggers a little bit later (i.e. z-platform higher).
if you use the stock z-endstop and not a non mechanic one (like an optosensor or a hall effect sensor) and if the screws holding the endstop are not tight enough, i guess this can happen.
Another possibility is that you z-platform itself went higher, because the screws holding it got unscrewed with the machine vibrations?
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