This is a T connector for 1 3/8in (1.375in ~ 35mm) closet rods. I needed a wide T connector because the rods needed to connect where the shelf support was so I needed a T connector as seen in the picture. The shaft size is set to 1.4in because that was the size I determined gave me the proper clearance for the shafts with my printer.
The author marked this model as their own original creation.