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How do you deal with uneven wheels?

Discussion in '3D printers' started by Asaku, Jul 14, 2018.

  1. Asaku

    Asaku Well-Known
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    Hello everyone, I got an ender 3 kit yesterday and the wheels from the X axis have a point where they get stuck. As soon as I've seen them I've immediately thought of openbuilds. I don't know which wheel is/are defective. I'd like some advice about how to approach this problem as my prints seem to be suffering from it.

    Here is the problem with the prints:
    [​IMG]
    [​IMG]
    [​IMG]

    Setup:
    [​IMG]

    Edit1: Added the photos directly
     
    #1 Asaku, Jul 14, 2018
    Last edited: Jul 14, 2018
  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Please post the photos here. Photobucket does not allow them to be viewed on systems using an adblocker.
     
    Asaku likes this.
  3. Asaku

    Asaku Well-Known
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    Sorry, added them.

    P.S. I've printed a second benchy and it's literally the same as the first one. I'm pretty sure it's frame related. What I'm not sure is if it's just the X axis.
     
  4. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Delrin wheels can get flat spots if they set in one position too long. This is also impacted by the quality of the Delrin and the amount of sustained pressure on them. Start by setting the pre-load pressure as low as possible, to a point where there is just enough pressure to keep the gantry stable and then let them relax for several hours. If that doesn't solve the problem you may want to upgrade to polycarbonate (assuming of course they're the same size as stock OpenBuilds wheels).
     
  5. Asaku

    Asaku Well-Known
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    Thank you for the reply. The kit was assembled yesterday and the gantry was not mounted under any pressure beforehand. I am not sure that releasing the pressure would help in this case.

    Edit: Since it's been bought from Amazon I'm considering having it changed... But it feels wrong to return an entire kit just for 1 wheel :(
     
  6. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Contact the manufacturer and see if they will offer any assistance. At $240, a defect is a defect no matter how large or small and if it keeps you from getting proper use out of the machine, send it back for a trade if you don't get any support. Be sure and keep an eye on the amazon return window. You might also try swapping out an OpenBuilds wheel if you've got one. Can't guarantee they are an exact match sizewise though.
     
    Amateur Maker likes this.
  7. Asaku

    Asaku Well-Known
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    Thanks Rick! I'll do just that!
     
  8. Amateur Maker

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    FWIW, I just returned my Ender3 (Comgrow was the reseller) and I felt bad about it, too. I hate returning stuff, but I was going to have spend another $60 to get the quality I wanted out of it. I may have over reacted but I sent it back and I'm saving up to buy an Original Prusa i3 MK3. I'll have the funds for the kit next week.
    I went through half a spool of filament over a 29 day period on the Ender and didn't get anything out of it that I wanted to keep. I know some was user error, I brand spanking new at this, but some was also quality related.

    I've seen YT vids where the issue was a bad bearing. You might turn the printer off and slowly roll along each axis to feel if there are rough spots. Then take out the bearings and see if one or more of them are bad. I'm guessing you can find replacement bearings at a local skate shop, or someone here can probably provide an online source.
     

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