Jump to content
UltiMaker Community of 3D Printing Experts

edges of large holes are getting randomly rounded.

Recommended Posts

Posted · edges of large holes are getting randomly rounded.

I am printing with PLA using PVA support material.


Internal edges of big openings are not printing nicely but are rounded. 





Is this an adhesion issue?  Something else?


Thanks very much,

Jake Kittell

Research Engineer

University of Vermont

  • Link to post
    Share on other sites

    Posted · edges of large holes are getting randomly rounded.

    It looks like it is happening only on the bottom layer?  Correct?

    1) check the glass carefully - feel for holes in the glass.  Sometimes when removing a print, the glass spalls and a chunk of glass ends up in the print.  These problems may be occuring over those "holes" in the glass.


    2) It looks like it's not touching the glass in those spots.  It looks like possibly some mild underextrusion or maybe you just need to add some sort of glue.


    Glue stick works pretty well.  Best results are with an extra thin layer - apply glue stick then using a wet tissue spread the glue around evenly (and removing most of it).


    Or you can mix wood glue with water.  Use 10 to 20 parts water for 1 part elmer's (or other brand) wood glue.  Mix it well and paint it on the bed with a cheap paint brush.  Heat the bed to normal printing temps (60C for PLA) until the glue dries (takes usually about 4 minutes).


    Or buy Magigoo.  (google it)


    • Like 1
    Link to post
    Share on other sites

    Posted · edges of large holes are getting randomly rounded.

    To me it looks like warping too, due to poor bed-adhesion in those areas.


    Make sure there is no dirt and no oil/grease on the glass, and no soap. Clean with whatever you want, glass cleaner, alcohol,... Then clean again, only with isopropanol alcohol. Then with warm tap water only, absolutely no soap (=reduces bonding), no additives. Especially if you print on bare glass without bonding.


    Then use any bonding method you prefer, if any.


    • Like 2
    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

      • 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
        • 13 replies
      • UltiMaker Cura 5.3.0-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.  
          • Heart
        • 17 replies
      • New here? Get ahead with a free onboarding course
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 14 replies
    • Create New...