Wall-mounted spool hanger
This is a wall-based spool mount that uses only printed parts. No dowels or rods required - just mounting hardware.
The clips were derived from Logan's "Spool Hanger Bracket" on Thingiverse. I added an additional chamfered hole for fastening below the clip for more secure mounting.
The bar that goes through the spool has a flat bottom for easy printing and a rounded top for easy spinning. The asymmetric design also means that the bar snaps nicely into the clips. The square ends are there to prevent it from slipping out just in case.
The wall mount ensures that the clips are mounted at the correct pitch. The hole in the middle allows for a slightly larger spool without longer clips, and saves on filament.
Use anchors or wood screws as appropriate for mounting to your wall.