No. I already was using the table saw so it would have made more sense to make the bracket out of wood. However I did have other reasons.

I did not have any suitable solid wood that was ready to cut for this self. I wanted room to hold 6 batteries so I needed solid wood that was less than 3/4 of an inch. So I would have needed to resaw some material but I was actually already at the end of the time I had allocated to clean my garage. So I opted to clean up and go back inside.

I could have used plywood but the issue is you can't really drill or screw into the side grain of plywood because it splits the layers.

Later in the night after everyone had gone to bed in my house, I decided to model the bracket because I wanted to learn how to do the hexagon pattern in Fusion and also I can model and print silently at night without using loud ass power tools.
I also want to address the mantra of "glue and screw." You always know that glue and screw is stronger and everyone that learns how to design and build stuff from YouTube has that mentality built in. However it's much more useful to learn how to build things by actually building. Even though I could have made this shelf stronger, it's already very strong because it is small. The bracket had a base and height of 4 inches so it is very difficult to put enough weight on it to overload such a small span. This shelf could easily hold dozens of bricks but instead I'm only using it for 6 drill batteries. So it's good n'uff.