1. Got a question or need help troubleshooting? Post to the troubleshooting forum or Search the forums!

Banding Fix for Robo R2

Discussion in 'Troubleshooting' started by John M. Fruits, Apr 14, 2019 at 5:41 PM.

  1. John M. Fruits

    Joined:
    Oct 9, 2013
    Messages:
    55
    Likes Received:
    22
    A while back, I posted an issue with my Robo R2 where I had severe banding on all of my prints. I had a bent Z Axis Rod, which Robo replaced free of charge. This is NOT intended to correct severe banding!!!!

    However, I did still see an issue (I think this is a design issue, on several levels) where I would see a rhythmic banding on my Robo R2's (I have two). They both showed the exact same pattern. So, I revisited the printer stiffener block that I made to correct the Z Axis issue, and found that it fixed the horizontal banding shown here as well!

    To me, The lower Z Axis motor and bearing rods are mounted to an injection molded angle shelf... Further more, the plastic shelf has bolt holes where the bearing rods slide into the bottom (and the top). It appears they originally intended to thread and bolt the Z Axis bearing rods in, but probably had an issue where the threading process was making the rods wider on the ends, so they omitted the bolting of the bearing rods. If the bearing rods were secured to the top and the bottom angle plates, maybe they would have been stiff enough to not cause this issue. But, we have what we have... and sometimes we just need to fix it ourselves.

    The print easily slides under the Z Axis motor, and if your printer is calibrated..... You should get a part that is 2.900" tall. I did re-level my bed(s) and reset my Z Axis offset(s)... not sure I had too, but I did for safety

    Good luck

    PS: Also, incase there is an issue with the files... here is a Thingiverse link:
    https://www.thingiverse.com/thing:3564800
     

    Attached Files:

    #1 John M. Fruits, Apr 14, 2019 at 5:41 PM
    Last edited: Apr 14, 2019 at 5:48 PM
    WheresWaldo and mark tomlinson like this.
  2. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
    Staff Member

    Joined:
    Feb 18, 2015
    Messages:
    5,687
    Likes Received:
    3,476
    I made one of those literally within weeks of having an R2. The plastic that holds the Z axis stepper is just not stiff enough to work over time without warping or sagging a bit.
     

Share This Page