Jump to content
UltiMaker Community of 3D Printing Experts

Shell thickness is wrong on first layers


Recommended Posts

Posted (edited) · Shell thickness is wrong on first layers

Hi all!


I have an issue with 4.6.2, I try to print a box but its first 30 layers are wrong (thinner than they should be) as of shell/wall thickness when the model is sitting horizontaly. (This is not happening with Simplify, so it's not my model's fault)

After the first 30 layers the shell/wall goes back to normal thickness.

Like something is forcing the slicer to make walls thin for 30 layers.


Strange thing is that if the model is vertical, it works fine.

I upload some photos to see the problem.


I've played around with many many settings, but I am at a dead end here.


Thanks for your help!

cura thickness.jpg

Edited by agiorgitis
  • Link to post
    Share on other sites

    Posted (edited) · Shell thickness is wrong on first layers

    Ah ok I found the issue!! I had set a hole offset of +0.45mm to accomodate for the holes. Apparently Cura assumes that the whole floor area is a big hole(!) thus adjusting everything inside to +0.45mm.

    The problem is that if you check my file, not everything is getting slimmer due to the hole setting, which is strange...


    Is there a setting to adjust the starting layer for identifying the holes? Or something where I select the maximum size a hole must have before adding the extra hole offset?

    Otherwise if I create a big barrel to store my pencils, it will still add +0.45mm to that one.

    Edited by agiorgitis
  • 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
        • 21 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...