Jump to content
UltiMaker Community of 3D Printing Experts

Bottom layer issues on intricate parts only


Recommended Posts

Posted · Bottom layer issues on intricate parts only

I'm trying to print a small hex lens but the bottom layer is an absolute mess. I've sat and watched the first layer extrude and it seems to just be how the output from Cura is telling the printer to print. Other items that a more simple but similar size or larger items don't have issues with the bottom layer. 

 

I've tried playing with different types of build plate adhesions in the advanced settings - currently set to none on the last print. I've played with different values for the initial layer height which has made no difference to the outcome at all. Any ideas? Pictures attached

IMG_20180521_144113.jpg

IMG_20180521_144126.jpg

  • Link to post
    Share on other sites

    Posted · Bottom layer issues on intricate parts only

    I've attached some more images after adjusting the hex size and thickness. Seems like the printer is printing triangles on the first layer?

    IMG_20180521_161926.jpg

    IMG_20180521_161902.jpg

  • Link to post
    Share on other sites

    Posted · Bottom layer issues on intricate parts only

    I've seen this hundreds of times.  On my own prints as well.  Your nozzle is too far from the glass.  So the first layer is barely sticking at all.  So as it prints those circles on the bottom layer sometimes they become triangles or other shapes.  What kind of printer is this?  If this is an Ultimaker then just turn the 3 bottom screws a half turn CCW to move the glass up a bit.

  • Link to post
    Share on other sites

    Posted · Bottom layer issues on intricate parts only

    examples of how bottom layer should look.  These pictures are from the internet mostly and I am just guessing that the bottom layer height for all of these is 0.3mm (cura defaults to 0.3 or 0.27 depending).  The numbers below indicate my best guess as to how far the nozzle was from the bed (again assuming .3mm is nominal).  

     

    The blue one is about perfect if you want it to stick really well.  the yellow one is a bit too squished but at least the part WILL NEVER COME LOOSE!  lol.  The black one is similar to what you are printing but even worse than what you did.  The red one is okay for small prints but for large prints they may come loose.  I aim for red or blue depending on my goals.  If I want it to stick better I squish a little more.  If I don't want the bottom layer to have a tiny brim I usually just set initial horizontal expansion to -0.2 or so but sometimes I instead go with what you see in red below.

     

    skirt.png

  • Link to post
    Share on other sites

    Posted · Bottom layer issues on intricate parts only

    Thanks, would you say that's definitely the case if I don't have any issues on larger objects? It's a creality cr-10. I only have this is issue on this part only but I'll definitely re adjust the bed

  • Link to post
    Share on other sites

    Posted · Bottom layer issues on intricate parts only

    All I can say is your bottom layer was severely underextruded but the layers above are fine.  That is always a leveling issue.

     

    Does cr10 have auto leveling?  If so a bit of filament on the tip of the nozzle can mess that up.  I am not a fan of auto leveling.

  • Link to post
    Share on other sites

    Posted · Bottom layer issues on intricate parts only

    No its manual. I'll give that a go and let you know. Thanks

  • 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...