Jump to content

Gradual infill inadequate behaviour


Recommended Posts

Posted · Gradual infill inadequate behaviour

Hello. I am facing a very strange printing anomalies when using gradual infill steps in models with sloped walls (anything over 8°) and any Extra Infill Wall Count more than 0.

The g-code then contains several printing sequences for these infill walls over the same place. It literary overprints same lines two-three times. 

Obviously this causes triple amount of filament on those lines and failed print. Setting higher step sizes will affect behaviour, most of my tests done at 1mm.

Often it in addition to that it generates a second infill wall, even if I choose Extra Infill Wall Count = 1.

I guess this second wall is supposed to be a border between higher and lower densities, but they are too close together to see any infill there.

Overall it feels like Cura is generating all of those "borders" even at layers where those are spaced at intervals shorter than the nozzle diameter.

There is no such behaviour when walls are vertical or less than 7° from vertical. 

This has been observed in v3.6, v4.6 and v4.6.1 at least.  All other settings irrelevant and tests have been carried out with completely default setting in freshly installed Cura as well as with my standard profile.

Unfortunately some of my filaments require very dense infill underneath top surfaces but it is unreasonable to print whole model at 40-50% infill.

If I switch off infill wall, then it generates very short lines of infill along the perimeter at maximum infill density which does not destroy the printed part, but half of the print time is spent for retracts even at 2mm @ 35mm/s. This often causes additional messy problems that are not solvable even with connected infill lines feature ON (then it overprint the infill pattern along the perimeter).

At the most optimal scenario (one infill wall and two gradual steps) it prints over the same line three times, blows up walls with excessive filament and causes the nozzle to catch those walls (sometimes with 1mm z-hop) and detach model from platform.

I have attached a very representative model, but this happens in other models too. This is visible during simulation, so no need printing every time (I found this out late) 

Attached pictures show model printed with my standard profile but at Gradual Infill Steps set to 0 and 2. Also sliced view without infill wall.




infill density.STL

  • Link to post
    Share on other sites

    Posted · Gradual infill inadequate behaviour

    There are 3 settings that affect gradual infill.  We need to know what you set all three to.  Please read this post - CLICK ON MY ICON JUST BELOW TO GET MY REPLY - DON'T CLICK ON THE ENTIRE TOPIC (you'll get that anyway but it will jump to my post).


  • Link to post
    Share on other sites

    Posted · Gradual infill inadequate behaviour

    Huh... this is complicated. It happens with any setting as long as there is more than 0 infill walls and more than 0 gradual infill steps. I have tried infill from 0.1% to 80%, step size from 0.5 to 10mm and step count from 1 to 10.

    Printed part on those photos was at 50% infill, 2 steps of 1mm (and 0, with no other changes at all).

    If I set it to 10 steps I get ten times overprint on the outer infill wall and 8.5 extra infill walls next to it.

    Here, I have recorded how it simulates it (and also prints) with ten steps. pay attention how many times it mover over the outer perimeter before starting to print internal ones:

    I doubt it is specific to me, so I guess it should be very easy to replicate...

    P.S.: Situation with excessive internal infill walls is not as bad with only 2 steps

  • Link to post
    Share on other sites

    • 1 month later...

    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
        • 56 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
        • 29 replies
    • Create New...