Jump to content
UltiMaker Community of 3D Printing Experts

How to remove PLA lump that backed up inside nozzle housing UM 2+?

Recommended Posts

Posted (edited) · How to remove PLA lump that backed up inside nozzle housing UM 2+?

I've had my Ultimaker 2+ a couple of weeks now and have printed several parts cleanly, both in PLA and ABS. Ok, so now I'm starting to think I know what I'm doing. Then last night I setup overnight print job using PLA. I came down this morning to find the incomplete part had detached from bed and a rat's nest of filament surrounding the moving print head.

Peering into nozzle mount structure I can see a lump of silver PLA backed up inside around the nozzle. Clearly after the part became detached, the filament started backing up. I went into "Atomic mode," cranking the temperature up to 260 C and had a bunch of the molten PLA slowly flow down and around the nozzle. I can still see a lump of PLA back in there. I removed the 0.25 mm nozzle that came out with the threads coated with PLA.

How the heck do I recover cleanly from this mess?

Thanks for the help!

Edited by Guest
  • Link to post
    Share on other sites

    Posted · How to remove PLA lump that backed up inside nozzle housing UM 2+?

    If it's around the outside of the nozzle and you can access it with some needle nose pliers, heat the nozzle upto about 100'C then pull it away with the pliers, a sort of external atomic clean. If you can't access it you may need to remove the fan duct first.

    If the nozzle was coated in PLA it would seem that it wasn't quite tight enough in the block, but be careful not to over tighten.

    To clear the treads you may need to heat up to 215 and wind in the nozzle to clean out the tread a bit and repeat it a few times, again if it is able to form a small bit you can grab with fine pliers drop the temperature to 100 and atomic pull it,.

    Worst case, you will have to remove the block, strip it down removing heater and sensor the use a small gas torch to burn out the filament without melting the brass.

  • Link to post
    Share on other sites

    Posted · How to remove PLA lump that backed up inside nozzle housing UM 2+?

    Thanks Izzy! Unfortunately its the "worst case." I did some preliminary disassembly of the printer head and now can see a big blob of PLA encasing the heating unit as well as the power supply wires and sensor. It will take some time to softer the PLA and remove it. Not a fine experience with my brand new UM 2+!!

  • Link to post
    Share on other sites

    Posted · How to remove PLA lump that backed up inside nozzle housing UM 2+?

    Did the leak come from the block to nozzle thread?

    Disassemble the fan duct to get better access, not meaning to blow own trumpet but check out my fan ducts on the YouMagine site, https://www.youmagine.com/designs/um2-fan-duct-v2

    Not sure if they fit the new fans but they should do, these allow you to fully see the print nozzle, you can adjust the height from the workpiece, and they swivel out of the way for maintenance.

    Also did you print off and use Andes torque tool for tightening the nozzle.

  • 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 Cura 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 22 replies
      • 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
        • 18 replies
      • UltiMaker Cura 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
        • 22 replies
    • Create New...