$fn = 25;

width = 153;
height = 80;
depth = 10;
holder_width = 50;
thickness = 2;
hole_diameter = 21;
hole_depth = 30;
angle = 7.5;

// stolen from openscad wiki
module prism(l, w, h) {
    polyhedron(//pt 0        1        2        3        4        5
        points=[[0,0,0], [l,0,0], [l,w,0], [0,w,0], [0,w,h], [l,w,h]],
        faces=[[0,1,2,3],[5,4,3,2],[0,4,5,1],[0,3,4],[5,2,1]]
    );
}

// iphone
// # cube([width, depth, height]);

translate([holder_width / 2, -thickness, -thickness]) {
    cube([holder_width, thickness, height + 2*thickness]);
    
    // Top grabber
    translate([0, 0, height + thickness]) {
        cube([holder_width, depth+ 2*thickness, thickness]);
        translate([0, depth + thickness, -thickness]) {
            cube([holder_width, thickness, 2*thickness]);
        }
    }    
    
    // Bottom grabber
    translate([0, 0, 0]) {
        cube([holder_width, depth+ 2*thickness, thickness]);
        translate([0, depth + thickness, 0]) {
            cube([holder_width, thickness, 2*thickness]);
        }
    }
    
    // Hole
    w = (hole_depth) * sin(angle) / sin(90 - angle);
    rotate([-angle, 0, 0])
        translate([holder_width / 2, -(hole_diameter + thickness*2) / 2 - w, hole_depth / 2]) {
        difference() {
            group() {
                cylinder(d = hole_diameter + thickness*2, h = hole_depth, center = true);
                rotate([180, 180, 0])
                    translate([-(hole_diameter + thickness*2) / 2, -(hole_diameter + thickness*2) / 2, -hole_depth / 2]) {
                    cube([hole_diameter + thickness*2, (hole_diameter + thickness*2) / 2, hole_depth]);
                    translate([0, -w, 0]) {
                        prism(l = hole_diameter + thickness*2, w = w, h = 30);
                    }
                }
            }  
            translate([0, 0, -thickness*2]) {
            cylinder(d = hole_diameter, h = hole_depth, center = true);
           }
        }
    }
}