Wire shelving vertical paper towel roll holder

This is a paper towel holder that is meant to grip onto the vertical bars of common wire shelving units, the type you can buy from hardware stores or Walmart. The top section and bottom section have holes sized for 3M screws that cut their own threads. The tube that holds the paper towel prints in 2 parts that screws into itself, and also screws into the base.

The top of the piece has a hinged section that is sized for a 3M screw and it can flip up for easy changing of paper towel rolls. There is a round threaded nut that screws onto the top of the tube tightening it against the top of the holder.