Jump to content

Time remaining


mark-hale

Recommended Posts

Posted · Time remaining

Have noticed that the time remaining, displayed on the Ultimaker2 seems to vary a great deal compared to CURA.

Was printing an item last night, which on CURA said 15mins, but on starting this on the UM2, the display showed 2 hours, this time fluctuated quite a bit and only seemed to be accurate in the last several minutes. It did actually only take 15 minutes so assume its a calibration issue.

Where does the printer get it's time estimates from, is this something that the end user can adjust.

 

  • Link to post
    Share on other sites

    Posted · Time remaining

    I haven't read through the firmware so I don't know but I'm guessing it's a simple estimation calculated based on how long the already printed layers took to print (average) * how many layers are left. That's why the estimate gets more accurate towards the end of the print. Cura probably does a more advanced calculation where it actually goes through and estimates the time for every layer all at once.

     

  • Link to post
    Share on other sites

    Posted · Time remaining

    The estimate on the screen is a bit of a complex piece of code, and it depends a bit on the GCode file. If you have the UM2 profile, then the UM2 will show the time estimate from Cura in the LCD panel before selecting the file.

    First, it calculates how long it has been printing already. Next, it takes how far it is in the GCode file, and how long the file is. With this it calculates the total time estimate for how long the print will take.

    When it has Cura estimate, it will look at how long it has been printing already, if this is less then half the time of the estimate, then it will use this estimate combined with the estimate from the "how far is the print" estimate. And depending on how far it is with printing the more the final estimate will shift towards the estimate from the actual printing time.

    Or, in pseudo code:

     


    printTime = [Time spend printing so far]
    filePosition = [current read position in the gcode file]
    fileSize = [total file size of the gcode file]
    timeEstimateFromCura = [Time estimate from Cura, if in GCode file]
    totalPrintTimeEstimate = printTime / filePosition * fileSize
    if printTime < timeEstimateFromCura / 2:
    f = printTime / (timeEstimateFromCura / 2)
    finalEstimate = totalPrintTimeEstimate * f + timeEstimateFromCura * (1.0 - f)
    else:
    finalEstimate = totalPrintTimeEstimate

    The "estimate by print time" is off for the first few layers because it's printing slower, so it's not that accurate at the beginning. The CuraEstimate is off due to it not accounting for acceleration.

    (There is also some odd overflow bug, that causes the display to jump to 6 hours sometimes)

     

  • Link to post
    Share on other sites

    Posted · Time remaining

    many thanks for the explanation. Yes funny you should mention the bug, I did notice that at one point.

    So far the figures in CURA seem close enough to help me decide to either wait for the print to finish or go to bed :grin:

     

  • Link to post
    Share on other sites

    Posted · Time remaining

    In my UM2 (non-plus) with original firmware, the calculation goes wrong when the tune-menu is kept open. For example when manually adjusting temp. If this tune-menu has been open for some time, then the remaining time sometimes increases to hours extra (on a print of a few hours). It looks like the calculation is paused or so? After the tune-menu has been closed, remaining time slowly recovers to reasonable values. But I don't care, since it doesn't affect print quality. :)

  • 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...