Wavy pattern

Hello everyone,

after changing my belts to GT2 20 teeth pulley my prints come out with wavy pattern on XY axes.
I have attached this mount thingiverse.com/thing:220056 to one axis, and left another one with stock bearing mount.
My print speed is 30 mm/s, 0.2 mm layer height with 0.4mm nozzle.
These are photos of the pattern I am getting:

onedrive.live.com/?cid=C6EFB474 … 645C%21105

Any help would be appreciated.

I also have these patterns and would like to know if anyone hase a solution to these.

That looks to me as if the belt and pulley don’t mate correctly. As the motor pulley turns, is there any up and down movement of the belt?

I had it with the standard belts, but i still heve it with the new gt2 belt setup.

The belt movement is smooth, without up and downs.

i also have these wavy edges, any solution?