Jump to content
Ultimaker Community of 3D Printing Experts

Capillary effect on 3D printer nozzle threads.


Recommended Posts

Posted · Capillary effect on 3D printer nozzle threads.

Hey all,  I've been running a custom build with a MK8 nozzle and an E3D titanium heatbreak for a while now, solely printing PETG. As I'm sure most of you know, often times PETG can make a pretty good mess of your hot-end especially during long prints. I recently went to switch my nozzle from a 0.4 to a 0.6 and when I took my hot-end apart there was filament along the threads of the nozzle and some of the heat break. After dozens of hours of printing I had no issues that would indicate a loose nozzle (oozing filament out of the heater block or flow issues) and it didn't seem to me that any filament had leaked from the inside out as I did a successful cold pull prior to disassembly and there was no filament pancaked between the two mating surfaces of the nozzle and heat-break. So my question is can the capillary effect cause filament to creep up the threads if there is space between the nozzle flange and the heater block? Or... am I just in denial that I didn't tighten my nozzle well enough?

  • Link to post
    Share on other sites

    Posted · Capillary effect on 3D printer nozzle threads.

    Normally, a well-tightened connection of a pipeline is absolutely gas- and watertight, even up to pressures of 200bar, as in my hydraulic machine. This is brass on brass, or brass on inox. However, the tiniest damage can cause it to leak.

     

    So I could imagine that one of both parts has an uneven mating surface from earlier contamination, or from careless machining, or from dropping or hitting something. Or one of the treads could be too short. Or, if the thread-cutting is done after machining the part to length, it will cause deformation and an uneven surface close to the cuts. That sort of things could also be a cause...

     

  • 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
     Share

    • Our picks

      • New here? Get ahead with a free onboarding course
        Hi,
         
        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.
        • 11 replies
    ×
    ×
    • Create New...