Jump to content
UltiMaker Community of 3D Printing Experts

print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support


herzla

Recommended Posts

Posted (edited) · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support

i was printing the whole day, since some hours in 5.3 release
suddenly my printhead crashed the bed - after some searching I checked the gcode and the first move goes to Z-1.19

 

G92 E0
G1 F1800 E-0.5
;LAYER_COUNT:396
;LAYER:0
M107
G0 F6000 X206.319 Y233.911 Z-1.19
;TYPE:SUPPORT
G1 F720 E0


i don't have a z-offset plugin installed
I also don'f find a setting to change Z-offset in Cura
currently several instances of Cura are running, all base on same profile, seems like only one instance starts at negative Z

byby PEI

//edit:
after some more testing it seems like Cura 5.3 has a Problem when the model starts in the air and needs to be support on full surface
in Cura 5.2 it works fine
image.thumb.png.fdd2d14861d6ee004fe5371b60f630b8.png

bed_crash.3mf

Edited by herzla
new information / new title
  • Link to post
    Share on other sites

    • herzla changed the title to print starts at negative Z ?? Cura 5.3 crashes bed when you model starts on support
    Posted · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support

    I added a little tube next to my model so something is touching the buildplate and now the print starts above the build plate but support-brim is missing
    /edit: it works again after I enabled skirt - before it was set to 'none' as I don't need print a skirt when support-brim is enabled
    image.thumb.png.8c5c7eb3a9dc22bd29da477ccfc07e3b.png

    image.thumb.png.59b8571827f166eb4b890d2d920abb3d.png

     

    this is how 1st layer looks in Cura 5.2:
    image.thumb.png.73bfd2f35d8f04c591292fa5cdaf9626.png

  • Link to post
    Share on other sites

    • herzla changed the title to print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support
    Posted · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support

    I've never seen Cura add a negative Z value.

    Here is your startup gcode:

    image.thumb.png.3531f1f5d638744fa0e0c8be7ba989ac.png

     

    Are you running OctoPrint?  Everything is commented out except the last line. 

    That last line appears to be missing the "close curly bracket" at the very end.

    The only post-processor I see running is Insert at Layer Change is that correct?

  • Link to post
    Share on other sites

    Posted · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support

    no, I'm not runninge Octoprint
    my Start-G-Code is corrent
    seems to be another Bug in 5.3 - it looked same on my computer until I resized the window - then the full code was visible
    only post-process is the standard 'Insert at Layer Change', and another script inserting layer-change information
    I can reproduce it any time when the Model starts 2mm above the bed with tree-support and support-roof active
    when the model starts on the print-bed everything is fine and working

  • Link to post
    Share on other sites

    Posted · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support

    I opened your project file and immediately created a gcode file.  This a snippet from Layer:0.

     

    PRINT_START BED=100 EXTRUDER=260 MATERIAL=ABS MATERIAL_BRAND=Extrudr
    G92 E0
    G92 E0
    G1 F1800 E-0.5
    ;LAYER_COUNT:410
    M240
    ;LAYER:0
    M107
    G0 F6000 X176.161 Y218.465 Z0.25
    ;TYPE:SUPPORT
    G1 F720 E0

     

    From your StartUp Gcode:

    PRINT_START BED={material_bed_temperature_layer_0} EXTRUDER={material_print_temperature_layer_0} MATERIAL={material_type} MATERIAL_BRAND={material_brand}

    That line is not a Marlin command and your Machine Settings show you using Marlin firmware.  What is running that will understand that command?  What runs the "other script"?

    What is the next "Z" value in the gcode?  Given your settings and "Adaptive Layers" it should be .35.

     

    If Cura routinely sent a print head to a negative Z location and smashed nozzles into beds - no one would use the software.

  • Link to post
    Share on other sites

    Posted · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support
    2 hours ago, GregValiant said:

    If Cura routinely sent a print head to a negative Z location and smashed nozzles into beds - no one would use the software.

    it never happened before and I can reproduce it in 5.3 release.. and I think most users place models to the plate..
    i also disabled all post-process-scripts and also arc-welder - just in standard-profile I didn't get that error and will continue testing


    when you slice it - is the model dropped to the bed in preview or is support below?

    PRINT_START is a standard command in klipper - just in Cura there is no option for klipper firmware..


    I attached the gcode so you see Z-value starts at -1.19 and continues "correct" (-1.09, -.99, -.89)

    negative_z_53.zip

  • Link to post
    Share on other sites

    Posted · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support

    i opened the project on another windows 10 computer with fresh cura 5.3 installed
    Z ist starting at -1.19
    when I use standard-profile the model get's dropped in preview but Z ist starging with positive value
    enabling adaptive layer (0.18+-0.8) makse the change - now also with absolute standard voron 2.4 profile Z is starting negative
    image.thumb.png.e78f6ede891cd3d11a10186244564920.png

     

    attaching a simple model producing same bug

    V350_MGN9_Assembly_Tool.3mf V350_MGN9_Assembly_Tool.gcode

  • Link to post
    Share on other sites

    Posted (edited) · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support

    I still can't reproduce it with that new file.  Your gcode file doesn't show any post processors running but I don't believe there is one that could affect the gcode like that.

     

    The problem definitely shows up in the gcode and the print doesn't get above Z0 until about Layer:10.  Something has told Cura to alter the Z and I would think that it might be something specific to your system but you said another computer showed the same behavior.

    I go over all the bug reports on Github and yours is the first I've seen of this behavior.

     

    Maybe @MariMakes and the Cura team have come across something like this during their de-bugging.

     

    Edited by GregValiant
  • Link to post
    Share on other sites

    Posted · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support
    1 hour ago, GregValiant said:

    I still can't reproduce it with that new file.

     

    may you answer my question about the preview - otherwhise I can't help you

     

    1 hour ago, GregValiant said:

    Something has told Cura to alter the Z

    as the model drops down every time and the bug is only on adaptive layers there is not much outside cura that will affect it
    the model dropping down in preview is a bug already and with adaptive layers it get's worse

     

    1 hour ago, GregValiant said:

    I would think that it might be something specific to your system

    😄 😄 😄 for sure, different language on OS and Cura 😄 😄 😄

     

    1 hour ago, GregValiant said:

    I go over all the bug reports on Github and yours is the first I've seen of this behavior.

    I beleve, I was sure before, it workes fine in 5.3 Beta 2 and I just know it's possible to let models start "in the air" since yesterday so I don't think a lot people do that.. and even less with adaptive layers ~~

    there have been a lot of (quite deep) changes from Beta 2 to release without public testing so I also still see tree-support growing through the model, brim errors and I see a lot more new and unsolved problems on github depending 5.3 "release"
    I got really sad when I saw the xmas-tree and don't know the reason why they needed to hurry on the release so may I just skip 5.3 and come back next year 😄

    may this thread prevents others to crash the bed - github may show us the truth soon

    • Heart 1
    Link to post
    Share on other sites

    Posted · print starts at negative Z ?? Cura 5.3 crashes bed when the model starts on support

    "Remove Empty First Layers" gehts hidden when support is active - seems like it gets disabled also in older Versions (until Beta2) but is hidden and active in 5.3 release

    when I disable support, than disable "Remove Empty First Layers" and then activate support again the GCode looks as espected and starts above the bed

    @GregValiant may you can check if this is same on your computer and may it was disabled?

  • 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
        • 22 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...