I designed this graph to be used for accessible education of graphing concepts to blind/visually impaired students. It was tested on, sighted and visually impaired users. they provided positive feedback regarding its usefulness in the classroom for BVI individuals as well as sighted students.
The graph will print so that the holes are slightly smaller than the pegs. I just used a drill to increase the hole size. Just find a bit that is the same size or slightly larger than the peg. I also recommend sanding down the braille as it can be a bit sharp when it is first printed.