Jump to content
UltiMaker Community of 3D Printing Experts

CoMeDoONE for Ultimaker2


Recommended Posts

Posted · CoMeDoONE for Ultimaker2

By the way I will continue testing to rule it out, but I don't think the resistors are the problem. Even with a big fan blowing air over the board Illuminartis test starts visually failing at 5mm^3/s

 

  • Link to post
    Share on other sites

    • Replies 84
    • Created
    • Last Reply

    Top Posters In This Topic

    Posted · CoMeDoONE for Ultimaker2

    Thanks for the update Cohen, I understand you are pretty busy over there at Ultimaker and need to prioritize your time. When I get my printer (should be within about a week, give or take several days) I plan on using a hall-effect current sensor to measure the current over time of the two motor coils. I'll post a link to the results here for easy reference. Perhaps the data will help you, perhaps not; but it's an independent test that may help yield conclusions with respect to your own data.

    Thanks again :D.

     

  • Link to post
    Share on other sites

    Posted · CoMeDoONE for Ultimaker2

    It could also quite simply be a another problem for some users.

    A friend told me the following:

    Step motors can, on reaching their performance limit, suddenly running back. Maybe the engines are not all the same powerful?

    So when the holding and feeding force is insufficient, then it may go backwards.

    I would need for further testing an original spare motor ...

    But Aaron, you're very interested in electromagnetics, right? What are you saying to this theory?

    Markus

  • Link to post
    Share on other sites

    Posted · CoMeDoONE for Ultimaker2
    It could also quite simply be a another problem for some users.A friend told me the following:Step motors can, on reaching their performance limit, suddenly running back.So when the holding and feeding force is insufficient, then it may go backwards.I would need for further testing an original spare motor ...But Aaron, you're very interested in electromagnetics, right? What are you saying to this theory?Markus

     

    Well, yes, that's exactly what happens when the extruder skips steps. It can't move the filament forwards with it's available current, and it can't crush the filament out of the way, so it runs backwards to a stable position.

  • Link to post
    Share on other sites

    Posted · CoMeDoONE for Ultimaker2

    @ illuminarti

    Can you or anyone else for me once do the following:

    Directly on the knurled wheel, measure the temperature during a Long printing period?

    Maybe someone has already made the original UM2 measurements, also I would like to know more, please. :smile:

  • Link to post
    Share on other sites

    Posted · CoMeDoONE for Ultimaker2

    m5qtoqy.jpg

    Here is a screenshot taken with the thermal camera with the board under extreme heat stress. The board is taped to a heated bed which is at 100C, with all motors connected and powered, and the XYZ stepper current set to 2000mA (E to the standard 1250), to get them as hot as possible. Cold start current is 1,03A, again measured with a multimeter through one coil, with the motor powered and set to full-step. At the highest temperature the sense resistors themselves got to 116 C, with the current dropping to 0,936A. And while it's not nothing, I think the resistors hold up well at such high temperatures.

     

  • Link to post
    Share on other sites

    Posted · CoMeDoONE for Ultimaker2

    Woah Cohen! You really went above and beyond in your analysis; I'm totally jealous with the thermal cam you got to play with :mrgreen:. I'm really excited to try and measure the current now. I'm really curious to see if I can see the current profile over time given the speed of the microstepping, the little devices I have yield a 5us response time. I, and I'm sure many other Ultimakers, appreciate all the time you spent testing the device so thoroughly. Looking forward to comparing notes in the future.

    Thanks again :-P.

     

  • Link to post
    Share on other sites

    Posted · CoMeDoONE for Ultimaker2

    Measuring temperature can be difficult.

    The thermal camera is a great tool but best to use to compare relative differences.

    The picture looks a bit out of focus, for a correct temperature reading it's important to have correct focus (use the focus ring :)) as well as having correct emissivity setting for the material setting. I suggest calibrating at room temperature (adjust emissivity to report room temperature before turning on printer when it has cooled off) as well as using a thermocouple or other contact thermometer attached to a measuring point as a secondary reference. Beware though that the secondary sensor might act as a heat sink.

    For best results the components should be somehow blackened/sootened to emulate a blackbody.

    I think other memebers like Bertho or Joergen might have useful input on this :)

    Regardless, good work!

  • Link to post
    Share on other sites

    Posted · CoMeDoONE for Ultimaker2

    Very nice summary about thermal imaging, gadgetfreak! :smile:

    You may add another point to be taken care of: the background. It is reflected on the part you are observing (although you don't see any reflection in visible light at all) and should therefore have a reasonable temperature (room temperature). An open sky as background is e.g. very bad (-80°C). :wacko:

     

  • 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...