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UM2: ball bearing replacement

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My Ultimaker 2 makes a creaking noise when the head is moved on the Y axis. I think the sound comes from the ball bearing at the far side of the left panel. This doesn't have an impact on print quality, but it doesn't sound healthy.

What specifications should I keep in mind when ordering a replacement ball bearing? It seems to have a ridge on one side to prevent it from being pushed through the side panel.

I assume I can slide the axis out to the right side when I loosen the screws on the pulleys.



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