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    Print quality suddently altered

    Hello, I'm new on this forum, I make 3D prototypes that I create with the great OpenSCAD software and print with a Creality CR-20.
    Recently I noticed a problem with the quality of the printing which I haven't found an answer on the net. It is the formation of small bubbles on walls. Then during printing the printer stops at times for a few seconds and then resumes printing. But this is not when the bubbles occur. Another curious phenomenon is that by printing the same part several times the bubbles tend to be positioned on the same places. See the example on the image of a 20 mm high object.
    I also wondered if the summer temperature in the room where I'm printing (about 29

    #2
    This video from CNC Kitchen likely shows what is happening and what settings to change to fix it without having to upgrade anything https://youtu.be/Hvw3DrVAeTA. You could upgrade and go to octoprint/klipper firmware on a raspberry pi (it's what I use) and you would have enough processing power to not see this issue (any 32bit board would have enough processing power to not see this issue either, like a bigtreetech skr). You can TRY to use a program/service like meshlab.net (open source) or netfabb online at https://service.netfabb.com/login.php to clean up the stl file to reduce the resolution/repair the file to reduce the number of steps the board has to process but the first video should have you printing well again. Happy printing.

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      #3
      Thank you very much for you suggestions which I found very interesting concerning Cure and Slic3r settings.
      Finally my problem was due tu bad transmission through the USB line because of an USB (2.0) switch placed on the line.
      best wishes, roberto

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        #4
        That's what happens when you don't ask if someone is printing from an SD card before offering solutions, lol. I didn't know you were printing from a host. I assumed you were printing from the machine and the stuttering was due to board not keeping up which can be an issue with 8 bit boards and high polygon models. Nice work fixing it and glad your printing again.

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          #5
          Thank you very much everything works fine now. I didn't suspect it was un US since I've been printing for months with an USB connection, but that was before I've installed that switch.
          All the best, stay safe...

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