Jump to content

What's causing these artifacts in my sliced model?


Rygno

Recommended Posts

Posted (edited) · What's causing these artifacts in my sliced model?

I'm trying to print a die model that I made in OpenSCAD, but slicing it in Cura creates ugly artifacts on the sides of the cube. I'm using the default profile for the ender 3. Is there something wrong with my model or is this a bug in Cura? How do I fix it? I've attached all relevant files, and the SCAD code is here.

 

 

cura_artifacts.png

CE3_die.gcode CE3_die.3mf die.stl

Edited by Rygno
  • Link to post
    Share on other sites

    Posted (edited) · What's causing these artifacts in my sliced model?

    I don't get things like that when I model things in Inventor.  I printed the die and the artifacts you show on the "5" side showed up very faintly.  It looks like an "X" crosswise and a square connecting the outside dots.  I think it might be something you did in OpenScad but I don't know that software.

     

    As I watched it print (this is how I use up the ends of rolls) I was thinking that the acceleration setting was either off or set very high.  When looking at the 3mf file you did have Accel and Jerk enabled at 500 and 8 which is very reasonable.  This is from the gcode file when I sliced the model

    ;LAYER:0
    M107
    M204 S500  Print and Travel Accel
    M205 X8 Y8  Jerk control

    G0 F7200 X102.903 Y102.37 Z0.2

     

    But the gcode file you posted (and that I printed) doesn't show any Accel or Jerk control.  In that case your printer (not being told anything different) would default to either the last Accel and Jerk settings used, or to the Max Accel setting in M201. 

    This is from the gcode file you supplied.  Something changed though between when you generated the gcode file and when you saved the project file.

    ;LAYER:0
    M107
    G0 F6000 X102.903 Y102.37 Z0.2

     

    My print showed a lot of ringing which I usually don't get at 50mm/sec.  I'm guessing that the printer went to 3000mm/sec² on Accel which is the maximum I have set in M201.  Also, the infill printed much faster than the 50mm/sec that your 3mf file showed.

     

    This is the wireframe view of the die in MS 3D Builder.  You can see how dense the triangles are that run around the dots on the 5 side.  I wonder if Cura is just getting a lot of short line segments there and that is causing the artifacts.  The pattern is exactly the same as I saw in the Cura preview and what showed up on the actual print.

    Untitled.thumb.png.e0265e5e6036bf79e0ecb08346be3daa.png

     

    Here is the Cura preview a few layers below the center dot of the 5.  You can see the short line segments being generated by the density of triangles in the STL file.  There are your artifacts.

    Untitled1.thumb.png.17a87ccada7fac73470705f6bd43ea67.png

     

    To take this analysis to the point of ridiculous - here is layer 39 in AutoCad.  Instead of 4 red lines making up the 4 outside walls path there are 90 lines that jig jog back and forth. There are a lot of line segments on the inner wall as well.

     

    953332728_DieLines.thumb.jpg.97fccc7fc13da43286f1727e777d5a4e.jpg

     

    Edited by GregValiant
    • Like 1
    Link to post
    Share on other sites

    Posted · What's causing these artifacts in my sliced model?

    Thanks a lot for your analysis! I was able to reduce the resolution of some of the curves in OpenSCAD, which seems to have resolved the problem.

  • 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

      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
         
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
         
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 48 replies
    ×
    ×
    • Create New...