WHAT IS IT?
This is a bracket/holder thing for holding a 1-inch dowel rod in place. You could add screw holes, but I'm not planning on using it to hold anything heavy; it's just for keeping filament on the shelf.
I've included a step file in case you need to modify this for a different size dowel rod!
ADDITIONAL HARDWARE NEEDED
MY PRINT SETTINGS
This thing can be printed however you like, really. You should probably print it with PETG and increased walls/infill so that it's fairly strong.