//translate([2,3,1]) sphere(10); // units are mm

//color([1,1,1]) cube(10);

radius = 10;

// difference 
// # - semi transparent
// * - mute
// % - semi transparent and not printed
// ! - solo
* translate([0,radius,radius]) hull() {
    %cube(radius+5, center=true);
    sphere(radius);
}

scaling = 7.2;
x = 10 * scaling;
comb = 2 * scaling;
//square([x, y], true);

//for(z=[1,10]) square([z+10, y], true);

module teeth(width, side) {
    eps = .5;
    depth = .5*side- width;
    // translate([-width/2, 3]) 
    translate([0, -width/4, 0]) 
    union() {
        square([width, width]);
        polygon(points = [[0, width-eps], 
            [-width/2, 2*width],
            [1.5*width, 2*width], 
            [width, width-eps]]);
    }
}

 module square_teeth(comb, width, height){ 
    translate([-comb/2, width/2 - comb]) teeth(comb);
        rotate([0, 0, 90]) translate([-comb/2, height/2 - comb]) teeth(comb, width);
        rotate([0, 0, 180]) translate([-comb/2, width/2 - comb]) teeth(comb, width);
        rotate([0, 0, 270]) translate([-comb/2, height/2 - comb]) teeth(comb, width);
}

module crescent_teeth(comb, big, small){ 
    translate([(big+small+comb)/2, comb]) rotate ([0,0, 180]) teeth(comb);
    eps = .25;
    translate([comb,(big+small-comb)/2]) rotate ([0,0, 90]) teeth(comb);
    //translate([big*1.5,8.25]) rotate([0,0,90]) teeth(comb);
    //translate([18.25,5]) rotate([0,0,180]) teeth(comb);
}


module square_shape(x, y, comb) {
    difference () {
        square([y,x], true);
        # square_teeth(comb, x, y);
    }
}

module crescent(x, comb){
        small = x;
    radius = 2;
    translate([x/2,0]) 
    // translate([x,0])
    difference() {
         intersection(){
            difference() {
                circle(radius*x);
                circle(small);
            }
            square(radius*x);  
        }
    # crescent_teeth(comb, radius*x, x);
    }
}
square_shape(x,2*x, comb);
*rotate([0,0,90]) teeth(2);
crescent(x, comb);