Ballsscrew support help

[andy_con]

If it wasn't making a noise originally, then it's unlikely to be anything stepper related.

Now don't take offense at the following questions, but I like to cover the basics.
What bearings did you fit?
Support block should be two angular contact 7xxx series bearings, not standard deep groove 6000 series.
And did you fit the bearings the correct way around, with outers races opposing/inner races facing?
And did you adjust the preload correctly?

No offence taken, this was kind of what I was getting at.

Original bearings on the right are 6001Z, they do not look like angular contact bearings.

They have been replaced with skf e2.6001-2z bearings.