Skipped Steps (2 replies)

So my printer is starting to skip steps on a lot of prints that previously came out fine. It's mainly the Y axis, but it looks like there may be a bit on the X axis as well. Here's a picture:



The Y axis goes from left to right in the picture and the layers where steps are skipped seems random. I've tried this print at least 5 times now and the layers height and number of layers with skipped steps are always different.

I've tried disassembling the Y carriage and lubricating the insides of the bearings and realigning the bearings with the bar clamps according to the procedure in the manual, but neither really improved anything. The skipped steps are nowhere near 2.5mm, they look to be .5mm at most. And I'm not sure if it means anything, but there seems to be a pattern after every layer with a skipped step. It looks like the layers skew in sets of 4. The first is only slightly shifted, the second shifts about twice that amount (about .5mm), third shifts the same as the second, and fourth shifts the same as the first. The print then goes on okay for awhile before doing the same thing.

Am I right in thinking my bearings have gone bad? Thanks for any help.