I built an outdoor printer enclosure and wanted to use the extra space I had in the rear to storage my extra spools of filament. You can storage filament like I did or use it as a filament spool hanger.
This was designed for a 1-1/4 inch PVC.
Link Reference: https://is.gd/khvcG1
Thingiverse: https://www.thingiverse.com/thing:4737588