A sample OpenSCAD file to generate a Die or Dice with the first letter of the Harry Potter Owl grades.

HarryPotterOwlGradeDice.scad

// Simple dice model that shows the grades of the Owl Test from
// Harry Potter
// Simple OpenSCAD example

// 2020 - Terrence Ezrol
// CC-0 - No Rights Reserved
//        https://creativecommons.org/share-your-work/public-domain/cc0/

// Font used on the Dice
FONT = "FreeMono:style=Bold";

//A text object to display on the side of the dice
module TextChar(ch){
    translate([3,3,-2]){
        linear_extrude(height = 2.5, center = false){
            text(ch,size=11,font=FONT);
        }
    }
}

//build the actuale object
difference(){
    //a cube, but testing linear extrude
    linear_extrude(height = 15, center = false)
        square(15,[0,0]);
    //combination of the 6 letters on the side
    //Passing O,E,A
    //Failing P,D,T
    union() {
        //Harry Potter Owl Grades
        translate([0,0,15])
            rotate([0,0,0])
                TextChar("O");
        translate([0,0,0])
            rotate([90,0,0])
                TextChar("E");
        translate([15,0,15])
            rotate([0,90,0])
                TextChar("A");

        translate([0,15,0])
            rotate([180,0,0])
                TextChar("P");
        translate([0,15,15])
            rotate([270,0,0])
                TextChar("D");
        translate([0,0,0])
            rotate([0,270,0])
                TextChar("T");
    }
}