Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4545168.

Rod in my closet collapsed because the flimsy holder broke. This was my fix. I added an additional chamfer to the inside edge than what you see in the photos, to give extra support.

My closet rod is about 30mm diameter, the space in the holder was designed at 32mm. The fusion 360 file "should" be parametric if you want to increase the size.