Jump to content
UltiMaker Community of 3D Printing Experts

Ultimaker PVA not sticking to PLA


Recommended Posts

Posted · Ultimaker PVA not sticking to PLA

I have already made some successful prints on my printer. If I print with only one material (PVA or PLA) I can print successfully. If I print with two materials and the PVA is glued to the plate it also prints correctly.

However, I tried to make an impression where a support structure for the PLA was necessary, built in PVA. In this print the PVA does not glue correctly to the PLA, consequently it moves and becomes totally deformed.

Does anyone have any idea what might be causing this behavior? The printer has less than a month.


  • Link to post
    Share on other sites

    Posted · Ultimaker PVA not sticking to PLA

    This is expected behavior. PVA sticks well to Nylon but not as well to PLA. There is a feature in cura called "horizontal expansion" which makes it so the PVA can also stick to the bed and gives you good results. Note that PLA on top of PVA works MUCH better than the other way around.

    So I recommend for this print, turn off brim (you don't need it for such a small part) and make sure "horizontal expansion" is set to 3mm (the default) for the PVA/support material.

  • Link to post
    Share on other sites

    Posted · Ultimaker PVA not sticking to PLA

    Please note: horizontal expansion is default in the PLA/PVA profiles. The default profiles are really good, I recommend not to experiment with settings before you have seen good results with these.

    See my pictures here

    By the way: if you want to get rid of any changes that you have made in the "Custom" tab with all the settings, click the drop down box, and select "discard current changes".



  • Link to post
    Share on other sites

    Posted · Ultimaker PVA not sticking to PLA

    It's possible that with brim turned on, for this particular model, that somehow the horizontal expansion was ignored as it would be placed on top of the brim. I'm hoping that turning off brim will fix this. The default settings work for most models but sometimes there's something a little unusual about a part where it needs a tweak to the settings (in this case possibly turn off brim. Maybe).

    Anyway all will be clear in layer view. Make sure the PVA is touching bare glass in a few spots so it stays in place before printing.

    • Like 1
    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 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 22 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.

        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 22 replies
    • Create New...