Jump to content
UltiMaker Community of 3D Printing Experts

UM2 Intermittent Underextrusion


Recommended Posts

Posted (edited) · UM2 Intermittent Underextrusion


Sorry for the rather generic title but I really couldn't think what else to put this under.

I am having some issues printing with a UM2, and I am looking for ideas to get things going again, as I am really at a loss.

So I have a UM2 that seems to under-extrude intermittently during a print, this very rarely happens on the first layer, but will pretty much occur on every other layer, no matter what size print.  Bit of background to hopefully help:

Material: PLA (never used anything but PLA)

Materials: Seen with both ColorFabb (black and white) and Faberdashery (grey, new)

Atomics: I have done a number of atomics, last time 5 in a row and the filament was coming out very cleanly

Temps: Seen at all temps from 200 to 230, tried all the way between these at 5 increments

Speed: Seen from 30mm/s upwards, I have not tried slower

Layer height: Seen from 0.1mm upwards, I have not tried lower than 0.1mm

Feeder: Is not grinding or jumping back

I have very good first layer adhesion, and have adjusted the bed up and down in small increments, and the results are the same.  Until I go too far and get a failed first layer.  The printer has printed OK in the past, no setting have been changed on the printer.  I have printed about 3 spools in total, all PLA.  I have had good prints from the ColorFabb in the past, but now these will not print correctly either.  I just purchased a spool of Faberdashery to see if it was material related but I get the same results with this too.

I have even tried printing a model that printed OK previously using the same GCode and filament and this also fails.

Its hard to get a good picture of but I have put one on to see if it helps anyone.  I will get others as needed etc.  I have printed the test print and this is OK from 3mm/s up to around 7mm/s then 8mm/s is a bit of a fail, 9mm/s and 10mm/s are OK ish.  

All and any ideas appreciated.






Edited by Guest
  • Link to post
    Share on other sites

    Posted · UM2 Intermittent Underextrusion


    do you have some more picture which display your under extrusion?

    On the prints you have displayed I can see some room for improvement, but I wouldn't necessary relate them to under extrusion.

    Looks like the small key chain has some retraction issues, and the top layer seems to be something wrong with it. How big is the entire thing?

    On the cup it actually looks pretty OK, except for the back.

    Was that an incident or do you have delamination every time?

  • Link to post
    Share on other sites

    Posted · UM2 Intermittent Underextrusion

    Thanks for the reply, I will try to get better pictures. I do have to admit these are not the best ones! Been getting a little annoyed and just been binning the failed prints, these have been quite a few recently.

    I will print something a little larger to make it more obvious and will update a bit later on.

    Sorry for the slow reply I missed the update.

  • 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

      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.

        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 13 replies
      • UltiMaker Cura 5.3.0-Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 17 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
        • 14 replies
    • Create New...