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3D print banding/ribbing?

Discussion in 'Troubleshooting' started by cthig, Jul 24, 2017.

  1. cthig

    cthig New Member

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    So I'm sort of new to 3D printing. I owned the R1+ and never had this problem with it. I've tried to research the issue I've come across, so I believe my problem is called banding or ribbing. It is an evenly spaced-out wave that goes along the z axis of my prints (as you can see in the picture). I've tried changing the temperature from 220 to 190 and that did nothing. Then I changed the quality but that also did nothing. Then I heard it could be vibrations or z wobble so i moved my printer off my table and printed it on the floor. As you can guess this also did nothing. I'm in need of some assistance. Thanks!


    Images: (Sorry they were too high def to upload)
    http://imgur.com/a/eJUVC
    - Far left is the test print
    - Other 3 are benchys
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Looks a lot like what I would expect from a bent rod.
     
  3. cthig

    cthig New Member

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    So what should I do?
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Call Robo and talk with a tier-2 tech

    You are going to need to deal with them directly for replacement.
     
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    This is not something you are doing incorrectly, there is something broken in the printer so you need to get them on the horn to sort it out.
     
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  6. cthig

    cthig New Member

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    Will they just replace the rods or the whole printer?
     
  7. cthig

    cthig New Member

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    Also can you link me the phone number please
     
  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Top left of your screen there is a tab that say HOME, then on the next page there is a CONTACT US link.
    On the CONTACT US page it says:

    [​IMG]
    Call us
    Call us anytime on our 24/7 help line at 844-476-2633
     
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  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Ask for a tier-2 technician, you will need to schedule a chat with them
     
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  10. Eric Albert

    Eric Albert New Member

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    I've got EXACTLY the same issue on my R2. Could this be the gantry one cog off on an axis instead of a bent rod?
     
  11. Geof

    Geof Volunteer Moderator
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    No the oeadscrew is bent for the z axis. You need to call robo
     
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  12. Eric Albert

    Eric Albert New Member

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    Geof: thanks - right you are - I raised and lowered the Z axis and watched the screw oscillate back and forth as it turned.... am online now with support
     
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  13. Redriche

    Redriche Member

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    I had the same issue. My replacement machine will be here Thursday.


    Sent from my iPhone using Tapatalk
     
  14. Eric Albert

    Eric Albert New Member

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    Wow - hope this is just an isolated set of machines. Just got mine 2 weeks ago and got it set up but was out on vacation and work and etc. so I didn't have much time to actually run it. Disappointing that it is defective. Wonder what the root cause was - seemed fine during upacking - no visible damage to anything.
     
  15. jwmueller

    jwmueller Active Member

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    What is interesting for me and I have seen Prusa comment on this as well in places. The screw will have a small degree of wobble and you don't want a bearing at the top to stop it from doing to as that will translate into the print in negative ways.

    I am curious on these Z-axis screws if they are warped, or the bearings have a bunch of slop in them. I have found my bearings to have a bunch of play when I move the bed up and down. All my other machines from different brands have upper wobble in the Z screws, but the bearings are good and I have minimal play.

    Can anyone get a ruler close enough while the screw spins to see if there is more going on?
     
  16. Eric Albert

    Eric Albert New Member

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    I also have a C2. It has a bearing on the top end of the Z screw. While the design is similar, my R2 doesn't have a bearing on the top. Support confirmed that is correct.

    I can definitely see wobble at the top of the screw as it spins. It is perhaps 2-3mm eccentric from center. I haven't measured it but I plan to or at least get a video clip showing the motion.

    The Z banding on my prints is consistent and very pronounced.
     
    #16 Eric Albert, Jul 26, 2017
    Last edited: Jul 26, 2017
  17. Geof

    Geof Volunteer Moderator
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    There is a chance in using cheap parts. I have bought "new" leadscrews that have a wobble but ok and "new" ones that are fine and "new" ones that dance :D cheap is cheap.

    (the source of the parts, not the machine)
     

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