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…
Apart from the usual bed cleaning tips it’s hard to guess where you are going wrong. Whenever I have problems it comes down to a “greasy” build plate. Simply touching it inbetween prints can make difficult geometries impossible.
I stick to 99,9% Isopropanol and have a tissue box next to my printer. I wipe down my build plate with a fresh tissue + alcohol before every print and have yet to see that method fail. It works great with PLA (60°C bed) but for PETG (80° bed) the alcohol evaporates too quickly. In the latter case I do the wipe down before reaching target temperature.
Thanks, will clean it again, this time as you suggested. Usually I use the isopropanol on the cold plate.