In putting it together, found that the doors dragged in the grooves which were too deep. Fix was easy, a 1/4 inch square dowel from hardware store cut lengthwise to fit was perfect. Dropped right in and  now, the doors'  rollers ride on the square dowel and glide easily and still stay in the grooves. Very happy with the look and sturdiness of the cabinet and love the adjustable shelves and lots of them.