Jump to content

Why is there no Z-Offset setting in Cura at all?


cnd

Recommended Posts

Posted · Why is there no Z-Offset setting in Cura at all?

GCode carries these commands..

 G28 Z0

 G92 Z0.2 

which let the user define the distance between the build plate and the nozzle (in my example above, it's 0.2mm)

 

That's a REALLY important number, because Cura will never output Z0 (if you set a layer height of 0.2mm, Cura's first layer will be Z0.2 - which, combined with the fact that my nozzle (and *Everyone else's*) does not touch the build platform at Z0, means that Cura is printing a 0.4mm high first layer, and wrongly thinking that it's 0.2mm high.

 

There are some ghastly kludges to try and overcome this mistake (like setting a first layer extra flow rate) - but this all seems really puzzling and bizarre to me.

 

The math to calculate exactly how much filament to extrude is going to get the answer 100% correct for EVERY layer (first included, no random kludges necessary) if Cura simply had some way for us to tell it what our Z Offset actually is.

 

Is there some sensible reason for this support being missing, or did the devs just never think about this properly in the first place?  It seems really bizarre to me - it's so incredibly obvious, and Cura is not the only slicer that skips right over this critical bit of information.  Maybe this is one of the contributing reasons for so many people having first-layer problems - software that has no way to properly compute a first-layer flow rate, because the programmers never gave anyone an input box to tell it what the Z offset is...

  • Link to post
    Share on other sites

    Posted · Why is there no Z-Offset setting in Cura at all?

    And before some smartypants says "edit the gcode" - keep in mind there's tens of millions of 3D printers in the world, and the overwhelming majority of them are run by "normal people" (not supercoders who know how to edit code)

  • Link to post
    Share on other sites

    Posted · Why is there no Z-Offset setting in Cura at all?

    I don't see this post as particularly trollish. Not everyone knows there's a plugin for this, so why not be helpful and say spread the word? (if only for others who find this post through some search).

     

    https://marketplace.ultimaker.com/app/cura/plugins/fieldofview/ZOffsetPlugin

    • Like 1
    Link to post
    Share on other sites

    Posted · Why is there no Z-Offset setting in Cura at all?

    Interesting! - and 317,000+ downloads, from a guy who actually worked on Cura for Utilmaker... which begs the question: why was he forced to release this as a plugin, and what politics prevented this setting finding its way into the product?

     

    I wonder if it's some kind of marketing decision, to deliberately give non-Utilmaker users more difficulty with their first layers...

  • Link to post
    Share on other sites

    Posted · Why is there no Z-Offset setting in Cura at all?

    I have used Ultimakers for about 4 years and never had a need to adjust z offset

    I have other machines where it is necessary (not done in the slicer though) but I do believe the auto calibration actually works for the Ultimakers.

     

    For those who need to fiddle with it, the plugin is right there for it.

     

     

    • Like 3
    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...