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Stripes Appearing on Prints

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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?

 

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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.

 

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