cube_size = 30;
iterations = 3;
pos = false;

smooth = 80;

rotate([45,-35,0])
    translate([(cube_size-1)/2,(cube_size-1)/2, (cube_size-1)/2])
    menger_cube(n = iterations, size = cube_size, p = pos);

cylinder(h=cube_size/7, r1=cube_size/2, r2=0, center=false, $fn = smooth);

module menger_cube(n, size, pos){
    if(n>0){
        for (i = [-1, 0, 1], j=[-1,0,1], k=[-1,0,1]){
            if (abs(i)+abs(j)+abs(k) > 1){
                translate([i*size/3, j*size/3, k*size/3])
                    menger_cube(n-1, size/3, pos);
            }
        }
    }
    if (n==0){
        cube(size, center = pos);
    }
}