I started with the design from Hooks or Hangers for Wire Rack mine is (Closetmaid Superslide) by BuddyC - Thingiverse and modified it for my needs. There are three different hooks.
I use 1" PVC for the filament spools to roll on and made plugs to fit the PVC and easily slot into the hangers. I glued the insert cap into the tube insert. The tube insert was a tight enough fit that I didn't need to glue it into the PVC.
The author remixed this model.