Shelf Bracket For Under Upper Kitchen Cabinet

I printed these brackets to mount a shelf under my upper kitchen cabinet for a charging station area. I used a 1x12 inch board for the shelf. The board was a little tight so i had to cut about 1/16 of an inch off the long side of the board on the table saw for it to fit in the bracket. There are three screw holes on the bottom of the bracket to secure the board and two screw holes on the top of the bracket to secure it to the cabinet. The board i used is 2 feet long. If your making a longer