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Ii have some issues, when i tight the belts, pulley goes down a little and whole mounting is not stiff, i can move it almost in any directions, that causing some problem with proper belt alignement and what is more important when i tight it more it is more hard to move the heated bed, after loosen belt bead move smoothly. I was hoping that it will be more smooth than rough after installing this upgrade, what to do ? please help :(