Jump to content

Inconsistant layer height changes and lowering Z to cause nozzle to drive into model with Cura 4.8 slicing for a CR-6 SE


jfulton-ak

Recommended Posts

Posted · Inconsistant layer height changes and lowering Z to cause nozzle to drive into model with Cura 4.8 slicing for a CR-6 SE

I am using Cura 4.8 with a Creality CR-6 SE and CR-6 Max.

 

When I sliced the Maker's Muse Printmas Christmas Tree Lattice, I blew it up to 400mm height, the max of the CR-6 Max. About 100 layers in, Z shifted back to 0, broke one of the limbs of the tree and drove the head into the base of the print, and the next layer went back up to the next height. At first I thought it was a corrupted SD card until I fed the GCODE file via Octoprint and I caught it doing the same thing again. Like a fool, I deleted the gcode file and resliced it and it printed fine this time.

 

Roll ahead 3 weeks now and I sliced BabyGroot.stl by Medelis and I experienced another odd inconsistent layer issue. I still have attached the gcode. Around layer 680 it switches from my selection of .12mm layer height to .16, then to .2, .2, and back to .12. This happens again at layer 689 going to .16, .2 for 4 layers, .16 for 3 layers and then back to .12.

 

At layer 804, it switches to .16, then layer 805, it does NOT change the Z height. It does this again on layer 809.

 

I did not find it yet in there, but somewhere it must have dropped the Z height downward because I came back into the room to the model popped off of the buildplate with an impression of the nozzle in the top of the model's head and it was printing spaghetti.

 

I used the default settings for the CR-6 SE with a .4mm nozzle, .12 super quality adjusting the print speed to 75, temp to 210, build plate to 65, and seam to sharpest corner with no support, 3 skirts at 5mm away.

BabyGroot-SE.zip

  • Link to post
    Share on other sites

    Posted · Inconsistant layer height changes and lowering Z to cause nozzle to drive into model with Cura 4.8 slicing for a CR-6 SE

    There are no Z moves in that file larger than your Z-hop height of .2mm.  Whenever it goes up .2mm for a Z-hop, it comes back down .2mm to the working height.

    According to the settings listed at the end of the gcode file, Adaptive Layers is turned on.

     

    [metadata]
    position=0
    type=quality_changes
    quality_type=adaptive
    setting_version=16

     

    Varying the layer heights to the model geometry is what Adaptive Layers is supposed to do.

  • Link to post
    Share on other sites

    Posted · Inconsistant layer height changes and lowering Z to cause nozzle to drive into model with Cura 4.8 slicing for a CR-6 SE

    Thank you GregValiant. I do not know how I enabled that as I am looking now in Cura and it is unchecked. I normally select New Project as I flip back and forth between my CR-6 SE and CR-6 Max and like to have the settings wiped clean each time.

    And after staring at the G-code for long enough, I see on those few layers where I didn't see an initial Z height change, that it was there a few lines above.

    I do need to find why it is driving the head down into the model though. I haven't found where in the file that happens or if my printer is having a brain fart at that point. Although with this print file, it reproduced it twice. May try again and watch it when it does it since I know the approx point it happens, maybe I can watch the layer count.

  • Link to post
    Share on other sites

    Posted · Inconsistant layer height changes and lowering Z to cause nozzle to drive into model with Cura 4.8 slicing for a CR-6 SE

    I read  the Gcode file using a macro in MSExcel.  It found 59,878 Z moves and none went down by more than .2mm.  That isn't enough to crash the head.

    Since you sent the file via Octoprint as well as by SD, that eliminates the possibility of a bad SD card.  I'm not sure what to look at next.  Sometimes a piece of infill or the edge of an overhang will stick up.  When the print head comes by again later it catches the part sticking up and pushes the model over.  I suppose it could get cocked and catch on the nozzle to leave a mark.  I increased my Z-hop height to .5 because of things like that (but it never got caught on the nozzle).

     

  • 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

      • 🎄✨ Thingiverse Tree Ornament Challenge! ✨🎄
        We've been running a Tree Ornament Challenge with a chance to win an UltiMaker S3 or colorFabb filament.
        Design a 3D printable tree ornament and join our festive challenge on Thingiverse. 🎁✨


        📆 Submission Deadline: December 22
        🏷️Tag your designs with Holidays2023

        Click here to join and check out the over 300 other amazing designs

        How to Enter
        Design an Ornament
        Create a 3D printable tree ornament that captures the magic of the winter season. Think snowflakes, sleighs, reindeer, cozy mittens, or anything that embodies the joy of the holidays. Upload to Thingiverse
        Share your masterpiece on Thingiverse and add the tag Holidays2023. Don't forget to include a captivating description and images that showcase your design from different angles. Submit by December 22
        All entries must be submitted by December 22nd to be eligible for consideration.
          Entering a new design
         
        Entering an existing design
         
         
        Winning designs should:
        Be original Creations
        Your designs should be original works, avoiding the use of others' intellectual property without permission. Include STL Files
        Each submission must include at least one STL file for 3D printing. Showcase a Completed Print
        Provide at least one photograph featuring a completed print of your design. Include Documentation
        Share the creative journey! Include documentation of your design process, giving us a peek behind the scenes. For example, show a screenshot of the model in your design program. Use the Tag Holidays2023.
        Use this tag to ensure your entry is counted in the Tree Ornament Challenge. Be submitted after October 1st, 2023
        Ensure your design was uploaded to Thingiverse after October 1st, 2023. Adhere to Submission Guidelines and Terms of Service
        Make sure your submission aligns with our guidelines and Thingiverse's Terms of Service.  
        Good luck 🎉
        • 1 reply
      • 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
        • 13 replies
    ×
    ×
    • Create New...