Jump to content
Ultimaker Community of 3D Printing Experts

Terrible Print Quality Issue


Recommended Posts

Posted · Terrible Print Quality Issue

I am trying to print 1 foot rectangular bars vertically. While I know that a tall, slender part printed vertically is not best, I know it can do it reasonably well because I've seen it done with this same part before on this same printer.


As you can see from the image, the printer isn't printing the parts well at all. It used to print well but it seems to not want to print right all of a sudden. I have tried the Atomic Method to clean out the nozzle but that didn't seem to work. Even if I print this lying down (which would make it much smaller and I would like to try and avoid that) I doubt it would improve quality since it starts printing like that even at the base plate.

Any help would be appreciated.


  • Link to post
    Share on other sites

    Posted · Terrible Print Quality Issue

    This is typical underextrusion. Pretty severe - Somewhere around 30% to 50% of the extrusion desigred (half to a 1/3).

    There are many possible causes. The likely problem is either your teflon part or your nozzle. But first the most common problem is that people print too cold or too fast. Check the table below to see if you are printing too cold or too fast (fast has to do with layer height also!).

    If you have the Olsson block this might be a good time to install it. Read the directions carefully - it's very very easy to destroy the temp sensor - but the guy who wrote these directions changed 100 blocks and only damaged one temp sensor so read his technique. Change the teflon part while you are at it. Often there is a thin coating of gunk inside the nozzle - especially if you printed with ABS a few prints ago. You can either put on the olsson block or you can remove do a cold pull, then remove the nozzle and soak it in acetone overnight (again be very very careful not to damage the temp sensor). Here's the directions:


    There are about 15 other possibilities so tell us more information (e.g. I changed the nozzle - that's not it, I change the teflon part 2 days ago - that's not it, I am printing same speed (but thicker layers) that used to work).

    Here are my recommended top speeds for .2mm layers (twice as fast for .1mm layers):

    20mm/sec at 200C

    30mm/sec at 210C

    40mm/sec at 225C

    50mm/sec at 240C

    The printer can do double these speeds but with huge difficulty and usually with a loss in part quality due to underextrusion. Different colors print best at quite different temperatures and due to imperfect temp sensors, some printers print 10C cool so use these values as an initial starting guideline and if you are still underextruding try raising the temp. But don't go over 240C with PLA.

  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now

    • Our picks

      • Ultimaker showcase | April 2022 | 4pm CEST | 10am EDT
        I'm excited because I've personally produced this showcase event, so if you are curious what else I'm up to nowadays, come check it out and say hi in the chat! It would mean a lot! 
          • Thanks
          • Like
        • 4 replies
      • New here? Get ahead with a free onboarding course
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 11 replies
    • Create New...