Help with Stripes on ultimaker 2 models

[sturmwaffendeveloping 0]

Hello everyone, I'm from Moscow. the other day I bought an ultimaker 2. Faced a problem. There are some cracks on the model. I printed out the walls (empty cube, with one wall 0.4) and this is what happened. The bearings were wedged along the Z axis, I replaced them along with the shafts. The XY print head also moved hard, I replaced 2 8mm shafts. But the problem hasn't gone away. I have now ordered all f688 2rs bearings as the head still has a hard time walking in the XY axes. The feed mechanism is installed from the Ultimaker 2+, the head is also replaced. Clarifications. Pla plastic, nozzle temperature 210. I changed the speed from 10 mm / s to 100 mm / s and nothing changed with the stripes.

[sturmwaffendeveloping 0]

for comparison, this wall was produced by picaso designer XL pro and this wall is beautiful.