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…

  • maiskanzler@feddit.deEnglish
    2·
    5 months ago

    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.

    • Carunga@feddit.deOPEnglish
      1·
      5 months ago

      Thanks, will clean it again, this time as you suggested. Usually I use the isopropanol on the cold plate.