$fn=40;
sm = 0.001;

module m1(){
    difference(){
        cylinder(r=5, h=40, center=true);
        rotate([0,0,45])translate([3,3,0])cube([6.1,6.1,50], center=true);
        rotate([0,0,45])translate([-3,-3,0])cube([6.1,6.1,50], center=true);
        cube([1.2,5,50], center=true);
        translate([0,-3.5,0])cube([20,2,50], center=true);
        translate([0,3.5,0])cube([20,2,50], center=true);
    }
    cube([2.5,1,19.8], center=true);
}

module m2(){
    difference(){
        m1();
        translate([0,0,-15]) cube([20,20,30], center=true);
    }
}
module sleeve(){
    difference(){
        cylinder(r=6, h=40, center=true);
        cylinder(r=5.1, h=50, center=true);
    }
}

difference(){
    m1();
    translate([-15, 0, 20])cube([30,30,30], center=true);
}
color([.8,.1,.1]) rotate([180,0,90]) translate([0+sm,0+sm,-20+sm]) m2();
difference(){
    color([.1,.5,.8]) translate([0,0,2*sm])sleeve();
    translate([-15, 0, 15])cube([30,30,30], center=true);
}