Stripes Appearing on Prints

[markstruct 0]

There are "stripes" appearing on my prints even though they are not in the design, please refer to the photo attached.

The stripes are quite uniform and the effect is kind of nice, but I still wonder what was causing that?

http://umforum.ultimaker.com/index.php?/gallery/album/935-questions/

 

[illuminarti 18]

What sort of printer is this? And presumably those stripes are parallel to the bed when printed?

Most likely you have some issues related to your z-screw, causing the bed to move in uneven amounts, depending on the rotation of the screw. What distance are the stripes apart? 3mm?

 

[markstruct 0]

This is an Ultimaker Original. Yes, the stripes are parallel to the print bed and are 3mm apart, I was guessing that it could be related to the z-screw as well, but not sure what is actually causing that?

 

[Dim3nsioneer 557]

I also have these lines on my UM1. I never could get rid of them completely. However, I managed to lessen them by using an Oldham coupling instead of the standard z coupling. It's partially a question of a good alignment of the threaded bar with the motor axis.