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loosen the M3 screws of the bearing blocks.. a little then move and bend until it runs smoothly.. without the belt on the motor..
Once its smootly going.. tighten the screws again , carefully.. test again .. and repeat until movement is smooth...

Be sure the Y Axis can still move axially in the front/rear brackets about 1 mm.. i added a little rubber so they donot knock..
then it should move better as with the ball bearings