Reversable bracket for holding 12mm rod in order to support filament spools. This design with the holes through the frame is stronger than the original "L-Bracket" design. This version also changes the "drop-in" slot for the rod to be straight down so one bracket design works for the left and right side. Also added a small hole in case you want to secure the rod with a screw. Can work with dowel rods or just about anything else. I'm using a 12mm carbon fiber tube I had laying around.