Jump to content
UltiMaker Community of 3D Printing Experts

Warping On Underside of PLA Parts


cmd348

Recommended Posts

Posted · Warping On Underside of PLA Parts

I’m experience warping on the underside of my parts - see attached images.

I’m using an Ultimaker 3, printing in PLA with a heated bed, fan cooling, and breakaway support (1+ degrees). Basically default printer/Cura settings.

Print quality is excellent otherwise. Warping is only present on the underside of the part, nowhere else.

IMG_8953.JPG

IMG_8952.JPG

  • Link to post
    Share on other sites

    Posted · Warping On Underside of PLA Parts

    This is just typical overhang issues.  This is a pretty steep overhang and overhangs are difficult to print.  Combine that with being very close to the heated bed and you aren't getting enough cooling.  Solutions:

     

    1) You could print on blue painters tape instead and let the bed stay cold.  If you do make sure you wash the tape with isopropyl alcohol and relevel (or just tighten the 3 screws about 1 full turn).

    2) Crank up the fan - make sure the fan is 100% on the very second layer!  Maybe even 100% on the first layer.  Also lower the bed temp to 50C (part may come off the bed if it's too long though so be wary - you might want to add an incredibly thin layer of pva glue - such as glue stick spread around with a wet tissue until it's invisible and also maybe raise the bed temp back to 60C when it's done with this difficult spot - having the part come loose 1cm up is a disaster and can destroy your print head due to flooding of filament in the print head).

    3) Change the design?   Can you make the chamfer at 45 degrees and then go into a curve?  Instead of starting with a curve immediately?  Like in this design document:

     

    https://support.3dverkstan.se/article/38-designing-for-3d-printing#chamfers

  • Link to post
    Share on other sites

    • 2 weeks later...
    Posted · Warping On Underside of PLA Parts

    Hey gr5,

    Thanks for the response:

    Regarding overhang - I’m using support starting at 0deg, with Z & X/Y support distance equal to the filament diameter. The rest of the part overhangs came out perfect - just the lower/right-facing surfaces had this issue.

    1) Painters tape is a last option - just spent almost 4K on a UM3 with a heated build plate. I’m looking into dialing in the right settings and get the most out the machine.

    2) My fan speed has always been at 100%. Taking your advice - I’m trying a print now with 60deg on the first layer, 50deg thereafter. I’m also using a glue stick to increase adhesion. I think the heated bed might be the culprit.

    3) Design change is not an option for this part.

    I’ll update once I print the new part. Thanks again.

  • Link to post
    Share on other sites

    Posted · Warping On Underside of PLA Parts
    18 minutes ago, cmd348 said:

    2) My fan speed has always been at 100%.

    Even on the bottom layer?  By default I think it doesn't reach 100% until the 8th layer.  By then your getting into the "easier" area of the print.

  • Link to post
    Share on other sites

    Posted · Warping On Underside of PLA Parts
    5 minutes ago, gr5 said:

    Even on the bottom layer?  By default I think it doesn't reach 100% until the 8th layer.  By then your getting into the "easier" area of the print.


    Thanks gr5,

    I just had a closer look at the cooling settings - full cooling was set a the 5th layer. I’ve changed that to the 2nd layer, keeping the 1st for adhesion. Hopefully this will help.

    -C

    • 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
        • 31 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
        • 25 replies
    ×
    ×
    • Create New...