Jump to content

DavidS


DavidS

Recommended Posts

Hello, If someone of you can help me with this (have look to the pictures) problem, I would be very happy.

I do not know where to change something in Cura to Stopp the filament flow earlier so that the edge 

not smear (grease) like on the picture.

Thank you for help.

David

Cura problem.jpg

  • Link to post
    Share on other sites

    An easy thing to try is to cut your print temp back to say 195° - 197° C. It seems little, but I have had that make a world of difference and sometimes a bit of speed reduction to go with the temp. But not always. Retractions I am not that expert about at all though, so that would require a much more experienced person than myself.

  • Link to post
    Share on other sites

    Well that doesn't look like much of an issue to me (sorry - don't want to say you are wrong or anything).  I mean I'd just cut that off after the print is done with a knife.

     

    HOWEVER, there may indeed be something you can do.  But first - did you look at the layer view and do you know exactly what is happening?  Do you know if that is a retraction move?  Does it actually retract?  if it doesn't retract the solution might be to play with retraction settings.

     

    More likely it *did* retract but the bottom layer has special considerations:

    If you want your parts to stick well it's best to squish the bottom layer a bit.  So when you level with calibration card I believe the card is 0.08mm thick and so the printer sets the Z to 0.08mm there such that Z=0.0mm is touching the glass.

     

    When you print, typically the bottom layer is always 0.3mm thick and it prints at z=0.3mm or 0.3mm off the glass.  But if you want your part to stick you should probably have the nozzle at 0.2mm off the glass. This makes the printer push much harder and makes the part stick really well.

     

    But you get a tiny elephant foot like brim around the part.  Which is kind of sharp.  And kind of annoying.  However there is a great feature in cura called "first layer horizontal expansion".  If you set that to negative half of your nozzle diameter (typically -0.2) I found this corrects the micro-brim issue.

     

    HOWEVER there is still one more issue - since you are overextruding all over the place on that bottom layer the pressure in the nozzle is unusually high and normal retraction is probably not enough getting you these little blobs.  I dont' have any good solution except to level slightly higher but then your part is likely to not stick and come loose during the print which is MUCH WORSE than a tiny little blob that can be easily cut off with a sharp knife.

     

    On the other hand maybe this has nothing to do with retraction moves as I haven't seen the slice view of this part.

  • Link to post
    Share on other sites

    Hi gr5,

    thank you for the bulkier answer. The retraction works, but maby I can adjust it better than it is now. If ther is possibility to start the retraction earlier than it must work. The other thing what I will try now after your answer is to go a few higher with the first layer... at the moment I am with the first layer quite down.

    So I do not have the problem that the part stick not really well, rather the opposite.

    If I find the solution I wili post it here.

     

    Thanks

    David

     

  • 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

      • Introducing Universal Cura Projects in the UltiMaker Cura 5.7 beta
        Strap in for the first Cura release of 2024! This 5.7 beta release brings new material profiles as well as cloud printing for Method series printers, and introduces a powerful new way of sharing print settings using printer-agnostic project files! Also, if you want to download the cute dinosaur card holder featured below, it was specially designed for this release and can be found on Thingiverse! 
          • Like
        • 10 replies
      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
         
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
    ×
    ×
    • Create New...