sliderblock moving up and down? change my bearings? video!

[Coenter 0]

Hello,

After years of useful info in this forum i end up making an account because i need help:

 

my Ultimaker 2 is making a scratch sound, after hours of investigation i found that it is the X-axis in the hot-end-carriage that is ''scratching'' the linear bearing when moving backward? is that possible? when i look at the slider-block it is moving up and down with the past of the axis it is sliding on. I noticed the axis on the front side is also moving but just the tiniest bit. 

 

Video of the slider block and the scratching sound:

 

 

all belts are on tension and i tighten all pulley. Any idea?

Edited April 9 by Coenter

[IRobertI 454]

The sliding block moving up and down is because that rod isn't perfectly straight. You could attempt to bend it back into shape, but that's not easy. Or you could buy a new one, or live with it if it's not affecting your prints in a way that bothers you.

 

The noise could be the bearing, but I'm suspecting the belts more. With time the belts dry out and get quite noisy. Easy way to check is to simply pop the rods out of the sliding blocks and try to move the rods through the print head outside of the printer and see what that feels like.

 

While the head is out, move the sliding blocks and see if the sound remains.