My version of a filament wall rack system which uses standards ¾" conduit as the main rod.  Brackets are mounted to the wall using standard drywall or construction screws.  I suggest installing the brackets into studs, and printing them with either PETG or ABS/ASA.  PLA might work, but typically creeps significantly over time.

There is  a separate intermediate support which only constrains the rod from the bottom, you can use that fall the brackets if you wish, but I only used it for the center supports.  The brackets also have a small hole on the bore where the rod is inserted which is meant for an M3 screw to act as a set screw to keep the rod from sliding around.