Jump to content

Infill line width


Recommended Posts

Posted · Infill line width



I'm having issues with infill line width setting in Cura 4.13.1 and Cura 5.0.0 with Ender 3 printer. I have a 0.4 mm nozzle and I am printing with PLA with 200° nozzle temp.


If I change just the infill line width to 0.6 or 0.8 mm, than in preview I can clearly sea the change in line width, but on the printed parts the line width stays the same at around 0.4 mm.


If I change setting Line width - so that all lines are now 0.8 mm, all the lines are being printed wider. Wall lines are a bit wider, but infill lines are about 0.7 mm.  


I printed a lot of test pieces with infill line width set to 0.4; 0.6 or 0.8 mm and they all stay the same.


I  was hoping to be able to print stronger parts faster, or at least test if they are stronger. But since the infill line width didn't change my parts got weaker do to less infill actually being produced. Difference in weight of the parts - theoretical and actual, is about 25% less than they should weigh according to preview. 


First picture is preview in Cura 4.13.1 with infill line width set to 0.4; 0.6 and 0.8. Second picture is the 3 cubes printed, and infill line width measured is 0.4 on all of them. And last picture is of a print with all Line width set to 0.8 mm than the infill line width measures 0.7 mm.


So is the problem software related? Or are there settings to be tweaked to get Just the infill line width to be 0.8 mm and rest of the lines to be 0.4 mm?


And I also tried to set all line width to 0.8 and than change individually perimeter line width to 0.4 mm, it was looking as I wanted in the preview but the actual part again came out wrong.



Tl;dr I am trying to keep the shell of the part a constant line width and perimeter count, and just change the infill line width. It works in preview, but not in reality.


help, please




  • Link to post
    Share on other sites

    Posted · Infill line width

    A lot goes on in that little rectangle below the nozzle.

    Line Width means different things in different situations.  Most people think of Line Width as the width of an extrusion under the nozzle...a rectangle that is "Line Width Wide" X "Layer Height Tall".

    Line Width is actually the index distance between two adjacent extrusions.  That results in a rectangle that is indeed Line Width wide by Layer Height tall.  When there is no adjacent extrusion (like with your infill), then the single extrusion is un-confined on either side.  The width of the extrusion is then a function of print speed, the calculated flow, plasticity of the material, print temperature, and (dependent on the flow rate) maybe some other things like turbulence in the nozzle and the cooling effect of the flowing plastic on the hot end.  This is in fact the problem I have with "Single Wall Calibration Cubes" but in your case they may actually be of some use.

    • In the Material section you can try adjusting the "Infill Flow" upwards.  This is where a single wall calibration cube may help.
    • You could also try adjusting the "Infill Speed" downwards.  Going slower may allow the plastic to spread further.
    • There is a new setting in 5.0 in the Speed section called "Flow Equalization Ratio".  The default is 100%.  Try setting it to 0% and see how it goes.

    Getting a single wall to be a specific width is usually a matter of flow (as in volume of filament/mm of extrusion/second).  The final shape of the unconfined "Rectangle" (and consequently the width of the extrusion) is not the same as an extrusion that is confined on one side.


    My Ender 3 Pro prints large models pretty good up to about 12mm³/sec.  With a .4 nozzle at .4 line width and .2 layer height that occurs at 150mm/sec print speed.

    If I was to double the line width then each extrusion would require double the plastic.  I would need to cut the print speed in half in order for the extruder to keep up.

    I would never advise to run any Line Width beyond about 1.25 X the nozzle diameter.  The velocity of the plastic coming out of the nozzle goes a lot higher and it's tougher to control how that plastic is going to spread.  In essence - if you want to print at .8 line width then put in a bigger nozzle.


  • Link to post
    Share on other sites

    Posted · Infill line width

    Thanks for your response.


    So that setting is a bit weird.

    I set line width to 0.4

    Infill line width to 0.8 

    and infill line multiplier to 3

    so I have 3 infill lines next to each other


    Now the overall width of infill lines in printed part is around 2.2mm (should be 2.4mm) but that's a reasonable error.

    Weird thing is that the middle line is still thinner at around 0.4 mm thickness but the lines on the side are closer to 0.8. 

    So probably a tunable issue, but don't want to deep dive in to that at the moment.


    Thank you!





  • 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
        • 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...