UM2 crackling noise on X-axis

[Orthotrope 0]

Hi all,

I just got a brand new UM2 extended. During the third print, I noticed ominous noises when the X-axis (the one from front to back is the X-axis, right?) was moving. It's a crackling noise that is also there when the axis is moved by hand and corresponds to about every half-turn of the drive shaft.

See the video below - very pronounced towards the end.

I checked as much as I could without taking anything apart yet, do you guys have an idea what could be causing it?

 

[JohnFox 25]

Don't know about the clicking/crackling sound but it's interesting to hear that you get the same 'grinding' noise that one or two of us get when the head moves from right to left while retract is on. ( starts at about 14 seconds in ).