Jump to content
Ultimaker Community of 3D Printing Experts

UM2 nozzle


shiremog

Recommended Posts

Posted · UM2 nozzle

I ask 'cause I'm getting carry-over of a previous filament, causing coloured streaks. Some of it is from the outside of the nozzle where I haven't cleaned it properly :roll: , some I believe is stringing in the bowden tube, but I suspect that some is trapped in that ridge inside the nozzle.

 

  • Link to post
    Share on other sites

    The easiest way to get rid of any residual plastic in the nozzle is with a so called "Atomic" or "Cold pull". You can read about how to do it here: http://support.3dverkstan.se/article/10-the

    I do one of those every time I change filament. But with one difference. I don't remove the bowden tube at the head. Instead I simply pull the filament from the back of the machine. I'm using a different feeder design that allows me to release the filament to make this easier but it can be done with the original feeder as well, just make sure the stepper isn't powered on by turning the machine off when it has reached the correct temperature.

     

  • Link to post
    Share on other sites

    One (maybe) interesting bit about the atomic method. Apart from the fact that some people seem to have had better results with Taulman 618 (pull temperature 140°), one should not rely completly on it. I just had the case where several subsequential pulls were clean and then "the last pull" showed dark spots around that shoulder on the tip. This seems to be the case when switching from Colorfabb XT to PLA.

     

  • Link to post
    Share on other sites
    Posted · UM2 nozzle

    So it does appear to be a design feature. I was thinking about making a replacement without the step, which I reckon would reduce the carry-over & reduce the chance of a blockage, but perhaps it would cause another set of problems. Has anyone tried it?

     

  • Link to post
    Share on other sites

    I'm certain ultimaker employees have tried it. Or reprap designers. But I don't know.

     

  • Link to post
    Share on other sites
    Posted · UM2 nozzle

    If I'm feeling bored one day, I'll make one & try it :ugeek:

     

  • Link to post
    Share on other sites

    Archived

    This topic is now archived and is closed to further replies.

    ×
    ×
    • Create New...