Jump to content

Fine tuning line width for small rectangular pyramids


Recommended Posts

Posted · Fine tuning line width for small rectangular pyramids

This thread is related to my nylon printing 'adventure'.  The part of the print I am struggling with is an upward facing gear-toothed circle.  It looks like the print is suffering from severe overextrusion and the nozzle is dragging material out to the perimeter.  Replaying the layer view in Cura, I am starting to wonder if the line width required for these gear teeth is narrower than I have set.


I'm using a 0.4 nozzle currently, have adaptive layers in use per a suggestion here and that has improved things somewhat.  Base layer height is set at .05 and width at 0.4.  When I look at how it tries to print that, I can imagine why there is excess filament.  When I increase line width to 0.45, it looks better in Cura.  I imagine it will slightly underextrude and that might offset whatever is going on.


Of course, if underextrusion is what I am doing, I would rather not do that do the rest of my print.  Can I set up a line width change to start at a specific layer?


Thanks once again...


  • Link to post
    Share on other sites

    Posted · Fine tuning line width for small rectangular pyramids

    Could you post images (screendumps) of the design in Cura, and photos of the results? The photos with ruler, so we can see the dimensions.


    I haven't printed with nylon yet, but there could be other things involved, such as insufficient cooling in a tiny model, so the model can't solidify. Or overextrusion due to slowing down in corners, when the internal pressure can't immediately be released, etc.


    For PLA, printing slow and cool usually helps. And printing a dummy tower next to very small prints, so the nozzle is away from the model, allowing it to cool, and so that printing-time per layer is equal for all layers.


    As said, this works for PLA and PET. But I don't know if it also applies to nylon (if too cool, you get poor layer bonding).


    But of course, it could be something else too.


    Below: a few images of the dummies: the basic concept, and a real model.






    • Thanks 1
    Link to post
    Share on other sites

    Posted · Fine tuning line width for small rectangular pyramids

    Thank you.  Your comment about slowing down in corners resonates - these are small teeth and corners are exactly where things are getting messy. 


    I'll try to explore ways to change how that path is laid down.   If it was CNC I would know how to change that toolpath, but I don't have that skill or knowledge (yet) here.  Fortunately, there are some smart people to ask here ?


    For a dummy tower, is that simply a matter of creating a separate STL and importing it to Cura, or can I do that within Cura itself?


    Thanks again!

  • 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 5.7 stable released
        Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more. 
          • Like
        • 7 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...