Jump to content
UltiMaker Community of 3D Printing Experts

Is every reverse move of the feeder a skip back? - Difference between calculated and real weight?


Recommended Posts

Posted · Is every reverse move of the feeder a skip back? - Difference between calculated and real weight?

My UM2 extended has printed about 20 hours yet. After problems with strange noise (see other thread) and some adjustments in my settings the results are not to bad at all. But...

Material: supplied PLA (silver) from UM, printed with factory set 210°C, heated bed at factory 60°C.

Printer is completely stock.

From the very first start of the printer the feeder turns a few degrees "back" sometimes. This happens not always, but there is barely a minute without this "tock" noise from the rear side...

The "visual ultimaker troubleshooting guide" talks about a quarter turn back when a skip back happens. Thats way more than my feeder does. So I am asking myself: Is the "pull back" of the material for only a few degrees (I would say 10-15) intended for printing reasons? Or should this never happen and as a result I a have a problem?

My first long (about 15hrs) print yesterday ended up with a weight of 160 grams - Cura said it should have a weight of 268g. I must admit, that I used the standard speeds after changing from fast to expert mode with the result of partly high extrusion rates... which should otherwise not be a problem with a good working printer?!

A test print yesterday (after some adjustments, mainly print speed) weighs 31g, Cura says 38g. (see photo)

This was printed with max. 4.8mm3/s. I am not to sure, but it may be, that the "tock" noise came mainly while printing at the maximum (inner wall).....

How big is the differene between calculated and real weight in your experience?

Both prints were printed with 0.2mm layer height. I want / have to print large parts without the need of perfection in inclined areas etc.

So am I having a problem with skip backs / under extrusion issue? Or am I to accurate in my expections?

Could a clogged nozzle be the reason for such problems after only 20 hours of printing without any material change? In addition the "tock" noise is from the very first test print there, I thought, this is normal.

I will try the atomic cleaning method now...

  • Link to post
    Share on other sites

    Posted (edited) · Is every reverse move of the feeder a skip back? - Difference between calculated and real weight?

    Well, could be that I am making some kind of "over-panic". Feel free to stop me from getting mad..

    Atomic cleaning: done - as predicted without any visible problems/dirt: nozzle clean

    Extrusion test: done - not as bad as suspected:

    extrusion_test1.jpg

    extrusion_test2.jpg

    Including 8 everything fine.

    BUT.

    "tocking" startet now and then at

    7mm3/s: https://www.dropbox.com/s/xiugtssauo2bwtf/7mm3s.m4v?dl=0

    But there are no visible problems in the printout, including even 8mm3/s with a little more tocking as in the video, see photos above.

    "tocking" more or less permanent at

    9mm3/s: https://www.dropbox.com/s/9vfc5roguu979mm/9mm3s.m4v?dl=0

    Here the problems with the printout began.

    At this point the tension of the feeder was about the second line from above - you can see this in the video.

    After filming I reduced tension completely, indicator above first line. Tocking was reduced then and the printout was a little bit better, as you can see on the second photo above.

    Forgot something: Already increased E Motor current to 1300mA!

    P.S.: How do you like my invention of the word "tocking"? ;)

    Edited by Guest
  • Link to post
    Share on other sites

    Posted · Is every reverse move of the feeder a skip back? - Difference between calculated and real weight?

    Forgot another fact: The previous test was printed at 230°C.

    After that I printed another extrusion test at 210°C. Here we go:

    IMG_2791.jpg

    IMG_2792.jpg

    Everything fine until including 6mm3/s. (with "tocking" now and then)

    At higher rates the noise got harder and the result shows typical under extrusion.

    So, panic or not. Something must be wrong here :(

  • Link to post
    Share on other sites

    Posted · Is every reverse move of the feeder a skip back? - Difference between calculated and real weight?

    This test is meant to be done at 230deg so anything under that will have problems.

    Increasing the E motor current can make it more hot and end up melting the filament at the feeder.

    The "tocking" sound is due to to much pressure build up and it skips backwards to prevent the material from being ground down by the feeder.

    So if this is "Tocking" regularly when printing at the correct temps and speeds means there is something causing to much force for the feeder to feed the material.

    This can come from tangles in the roll or something else after the feeder.

    I recently had the same issue in a new machine and found the PTFE coupler was the problem.

    If you have performed a few good atomic pulls and is clear then you may want to look at what else in line could cause the issue.

  • Link to post
    Share on other sites

    Posted · Is every reverse move of the feeder a skip back? - Difference between calculated and real weight?

    A low roll of filament can also cause it as the filament is tightly wound and doesn't like going through the bowden tube.

  • 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
     Share

    • Our picks

      • 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
        • 10 replies
      • UltiMaker Cura 5.3.0-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
        • 16 replies
      • New here? Get ahead with a free onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 14 replies
    ×
    ×
    • Create New...