I had a piece of lumber lying around and decided to make it into a shelf. I think it is a 1x5 dimensional pine board, measures 19x116mm.
The hooks can be printed in vase mode with 1.0 mm line width with a 0.6 mm nozzle.
Brackets use #6 button head drywall screws to mount to the wall and end brackets use #8 flathead wood screws to attach to the ends of the board.