Just a simple spool rack I designed to hang on the side of the keyhole shelving I was already using for my printers. Uses 19mm or ¾" OD Dowels or Aluminum tubes. Your choice of materials. Length will vary according to application.

Holds sealed rolls of Bambu filament just fine, boxes would require more spacing vertically and between the rods.

I've had PETG and PLA ones hanging for literal years, though I would suggest ABS.