I used 3/4 inch sch-40 PVC pipe. For the Side brackets, mirror the Z axis. Fit in the holes on the side of the shelf that are 5mm. I printed them diagonally and have had no issues so far. Cut to the length of the shelf width minus roughly 1/4 inch or like 8mm. Printed in PETG strong and sturdy. I apologize, the pictures are not pretty.