include <BOSL2/std.scad>

base = [250, 135, 4];
box = [235,120, 95];
t = 1.5;
$slop = 1;
c1 = 0.5;
c2 = -0.5;
top = [120,30];


box_out = [box[0]+2*t, box[1]+2*t, box[2]+t];
// top box
up(box_out[2]/2) difference() {
    // box
    cuboid(box_out, chamfer=c1, edges=[TOP,"Z"]);
    // hollow middle
    down(t/2) cuboid(box);
    // hole at the top
    up(box_out[2]/2) union() {
        left(top[0]/2)  cyl(d=top[1], h=t, anchor=TOP, chamfer=c2);
        right(top[0]/2) cyl(d=top[1], h=t, anchor=TOP, chamfer=c2);
        cuboid([top[0], top[1], t], anchor=TOP, chamfer=c2);
    }
}
// base
down(base[2])difference() {
    cuboid(base, chamfer=c1);
    difference() {
        // box
        up(base[2]/2) cuboid([box_out[0]+$slop,box_out[1]+$slop,base[2]], chamfer=c1, edges="Z");
        // hollow middle
        down(t/2) cuboid([box[0]-$slop,box[1]-$slop,box[2]]);
    }
}