Hello folks! Build a MK4 4 months ago and was very happy with it so far. Now I have bed adhesion problems (see pic attached). 3 weeks ago I had similar problems and after a chat with prusa and resetting the calibration / cleaning the build plate again it worked fine. Now the problem is back despite a clean build plate . After resetting the calibration I got one nice print and then the same problem again. Cold pull of the nozzle resulted in a clean tip and no better results, so I do not think there is any clogging. Also the plate and the should be alright, as I got good results inbetween. Any ideas / hints where my problem is? Link leads to image of the problem. Could not upload the file for some reason…
No (I have an XL with a nozzle wiping mod), but it might make sense to check if the filament/temperature combination produces ooze. Because when I had that Issue I had similar intermittent issues which looked like your image, which I guess is a too high nozzle due to build-up filament on the nozzle during probing, which results in the gaps between the laid down filament, as well as the low bed adhesion.
I would check for a few prints if oozing is the core issue or not, and depending if I want to keep using that filament (e.g. a gifted 200g roll would not be worth the effort in my personal view), I might try and reduce the nozzle Temperature which the printer sets before tapping the bed.