Heat Creep



  • I can get a decent enough 1st layer sometimes, but then the nozzle (Nozzle X) clogs. I am able to clear the clog, but as soon as I try to print again, it clogs right back up.

    Using PLA with a Printing Temperature of 200C and a Print Speed of 45mm/s.

    Ran PID calibration as well.

    When installing the heat break, I used thermal paste on the threads that went into the heat sink in an effort to help prevent this very problem. I also replaced the little fan that came with the hotend with a larger one. Parts cooling is via 2 blowers. mimages via Dropbox

    Not sure what lines of the config.g or config_override.g are applicable (if any).

    I know Heat Creep is caused by hot end temps being too high, but if I try to run @ 190C like I did with the stock V5 hotend the printer came with, I can't get a consistent extrusion to stick to the bed.

    Does anyone have any ideas of things I can try to fix the issue?



  • @beanman1 Reduce the amount of retraction. The most common cause of heat break blockages is molten filament being drawn up into the heat break where it will cool and solidify.



  • My current Retraction settings are:

    Distance - 6.5mm
    Speed (Retract and Prime): 25mm/s



  • Yeah, the print I was just trying printed the skirt beautifully, but as soon as it tried to start the actual 1st layer of the model, the filament just blobbed up on the nozzle.


  • Moderator

    Start with 1mm of retraction and see if there is an improvement.

    You can use firmware retraction so that you can modify it on the fly during a print. This is useful for the tuning phase since you don't have to rely on the slicer and reslice the whole file again to change the retraction.

    https://forum.duet3d.com/topic/6181/tuning-macros-menus-accel-jerk-retraction-pressure-advance?_=1592332339385

    These macros may help in your tuning.


Log in to reply