Jump to content
Ultimaker Community of 3D Printing Experts

What's my problème ?


Recommended Posts

Posted · What's my problème ?

Hi guys,

I just want to know if anyone can help me with my new problem. I'm sure it's not under extrusion or over extrusion because i tried with different temp and speed but nothing changed.

Looks like the line of the same layers are not always perfectly alined. This happened more on big and complex print.

 

Just so you know : i've tightened all the belts (a lot) and pulley's screws add some lub on the axes. Bed is leveled (might not be perfect but leveled).

 

mini_8907492201.jpg

 

mini_8907492201.jpg

 

mini_8599261403.jpg

 

Thanks for your help.

 

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    I think it's probably backlash due to the belt tension still being off a bit. Did you make sure that your shortbelts are nice and tight? If not that, then it might be some sort of underextrusion due to oozing during travel moves, depending on the geometry of what you're printing.

    Seeing the gcode for the affected parts might help see if there's anything odd going on.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    Thanks guys. I'm not at my place right now but as soon as i get there, i'll try to slice/check/print and send you pictures and gcode.

    I think it can really be slicing issue because my belts are very very very tight (maybe too much) and i don't think i had this kind of issues 1or 2 months ago.

    But your right i do have backlash issues and i'll put my motor on direct drive as soon as i get my couplers.

    Juste one more question, i've the ultimaker since september and i did not update the firmware in it (it's the original one). I've to do something ? Update or change for different ? (it's the part i dont understand very well).

    Thanks again for your help.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    No, the current firmware that comes with Cura is the same as you currently have on the machine. It hasn't changed in about 9 months. You can build your own firmware from the source on Github if you need newer or custom features (such as a heated bed) but there's no particular need to do so.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    OK. Thanks illuminarti.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    Hey guys,

    I was doing some test. And i noticed something. When my print start the temp ( set to 210) don't stop changing from approx 190 to 216. I didn't noticed that before but can be part of my missing line issue ?

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    When my print start the temp ( set to 210) don't stop changing from approx 190 to 216

     

    double negatives are confusing. You mean the temp oscillates between 190C and 216C? Yes that could be a problem. At 190C the plastic is thick like toothpaste and tends to underextrude.

    UM Original? Do you have an ulticontroller?

    Consider re-running the Cura first-run wizard that autotunes the PID values for your nozzle. You will need to connect your computer to your printer with a USB cable to do this. Make a note of the PID values. If not displayed by cura there are 2 other ways to get them (pronterface or using ulticontroller).

    The PID values control how the UM sets the temperature. If P or I are too large it will oscillate. D reduces oscillation but if D is too high or P is too low it will take a long time to reach the desired temperature.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    Sorry gr5, i'm french and my english is not perfect.

    And yes the temp oscillates but it's only on the first 6/7 layers i think. I'll check the PID and let you know.

    It's an UM 1 with ulticontroller.

    I printed a batch of banana belt tensioner and i noticed that on those print on front the problem is more present than those at the back. Do you think my problem can be the bed level ?

    (Very sorry for my english it's not always easy.)

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    Bed level only affects the first layer. Sometimes the second layer.

    Consider simply lowering the P value by 2X. More about PID here:

    http://fr.wikipedia.org/wiki/R%C3%A9gulateur_PID

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    My values are:

    P 22

    I 1

    D 114

    I think these are the default values.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    Hi,

    So i did re-run the wizard, temp problems are gone !! :) I put my motors on direct drive and it's awesome ! No more backlash or ugly top/bottom layers.

    The intresting thing is that in order to do the upgrade i had to loose all the long belts. I directly print after the big instal and the first print was PERFECT. So i guess that means my "missing" or "miss placing" line issue is due to the large blet tension.

    Can it be to much ? I've the banana tensioner, is this one good ?

    If the large blets dont have exaclty the same tension, is that a problem ?

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    My UM1 belts are much looser than I would have expected belts should be. I get good quality.

    I have heard that tight belts cause high friction and may cause other problems.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    Thanks gr5.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    Hi guys,

    So temp problem are back there is my values :

    PID :

    -P 22.20

    -I 00.14

    -D 869.75

    -C 1

    I tried to put 11 as P value but it's not better.

     

  • Link to post
    Share on other sites
    Posted · What's my problème ?

    Sometimes there is electrical noise/interference between the fan signal and the temperature signal. Sometimes the problem is worse when the fan is *not* at 100% or 0%. The solution is usually to move the fan wires in the print head away from the thermocouple wires. The problem area is not above the head. The problem area is between the thermocouple and the tiny circuit board on the print head.

    As a test, set the fan to 0% and temp to 200C. Watch the temperature curve. After it settles, turn the fan on to 50%. See if it starts to oscillate or swing randomly. Then set fan to 100% and watch again.

    Another common problem is the cable and connector. AFter the above test, while head is at 200C push it around to the 4 corners several times. Pause in each corner to see if the temperature changes suddenly. If it does you have bad wiring above the head.

     

  • 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

      • Talking additive | The 3D printing podcast
        Why should we be the only ones asking questions? Join us and ask Jabil all your questions on September 22nd 5pm CET
          • Like
        • 3 replies
      • Ultimaker masterclass: Optimizing your Ultimaker Cura workflow
        Save your seat for either broadcast on September 23.
        What will you learn?
        · Best practices for iterative print preparation and every lesson you should learn from each print
        · The right way to use per-object settings and when they are most useful
        · Easy-to-use resources for anyone who wants to develop their own printer definitions, plugins, or print profiles
        · How to optimize print profile settings and whether to “keep” or “discard” changes
        · When is the right time to export your drawing from CAD? (Based on Ultimaker Cura’s surprising power as 3D control software)
        · And a whole lot more tips and tricks!
         
        How can I join?
        This free masterclass will take place twice:
        1. 11am CEST (5pm SGT, 5am EDT)
        2. 5pm CEST (11am EDT, 8am PDT, 11pm SGT)
          • Like
        • 0 replies
      • Do you use 3D printing at work? Let us know
        It doesn't matter if you are using 1 Ultimaker or 10, there is inspiration in everything. We're looking for ...
        • 1 reply
    ×
    ×
    • Create New...