module rounded_cube(d,r) {
    hull() for(p=[[r,r,r], [r,r,d[2]-r], [r,d[1]-r,r], [r,d[1]-r,d[2]-r],
                  [d[0]-r,r,r], [d[0]-r,r,d[2]-r], [d[0]-r,d[1]-r,r], [d[0]-r,d[1]-r,d[2]-r]])
        translate(p) sphere(r);
}
difference(){
    translate([-5,-5,-5])
rounded_cube([150,70,50], 5);
     
    rounded_cube([140,60,40], 5); 
  translate([30,0,0])
cube([80,60,60]);   }