Jump to content

PVA support material outside of 3D print


Recommended Posts

Posted · PVA support material outside of 3D print


As I was looking through the Forum I could not find aa answer to the following question. If there is: I am sorry, I am new here :)

I have recently started to print with the option of dual extrusion. When I use the natural PVA as a support material Cura is always placing a wall outside of the actual model, even though there are no overhangs. Is there any reason for this or a simple solution to avoid this wall? It seems like it is just a waste of the PVA material and it is prolonging the actual 3D print quite significantly. 

Many thanks in advance!


Screenshot 2018-10-10 at 15.58.33.png

  • Link to post
    Share on other sites

    Posted · PVA support material outside of 3D print

    This is probably because of "support horizontal expansion" and is occasionally a waste but usually a good thing because...


    PLA sticks nicely on top of PVA but not the other other way around - PVA does not stick so well on top of PLA.  But it sticks great to the glass and to itself.  So if you were printing say a cube with a large horizontal hole through it and you wanted support inside the tube.  It's best to connect the PVA inside the tube down to the glass bed.  "support horizontal expansion" takes care of that situation and many more (but not all situations).


    I'd have to see the rest of your model to know if what you circled is very helpful or just a waste of PVA.

    • Like 1
    Link to post
    Share on other sites

    Posted (edited) · PVA support material outside of 3D print

    Hi gr5,

    Thank you for your quick reply!

    I understand why it would need to stick on the glass plate in this case, but for me it would only make sense to have it inside the object really. I have attached some more pictures of my 3D model, I hope they are helpful!

    Thank you again ?



    Screenshot 2018-10-11 at 09.12.24.png




    Screenshot 2018-10-10 at 16.55.52.png

    Edited by Japakli
  • Link to post
    Share on other sites

    Posted (edited) · PVA support material outside of 3D print

    I think you have a special case here, where the auto-generation indeed produces "useless" supports.

    But one thing: do you really have to print the model in that specific orientation? To me, it seems that rotating it, so the flat face on the opposite side of the opening lies on the print plate, would be much more efficient, as you wouldn't need any PVA at all...

    Edited by P3D
  • Link to post
    Share on other sites

    Posted · PVA support material outside of 3D print

    Hi P3D,

    Yes, you are right, rotation would save me the struggle with the PVA. But I am printing in this orientation for a specific reason.
    I am using clear PC filament and want the two hexagonal faces to be as clear as possible. When I print it upright the faces become very milky white, in this orientation they become quite clear ?


  • Link to post
    Share on other sites

    Posted (edited) · PVA support material outside of 3D print

    this happens when the horizontal expansion from both sides is bigger then the wall thickness. When the wall is thicker this doesn't happen. What you could do is set the support horizontal expansion to zero.


    Edited by peggyb
  • 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

      • 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
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 6 replies
    • Create New...