module sample() {
    cylinder(19, 6, 6);

}


module main_tube(c_cut, c_cut_h, m_cut) {
    difference() {
        cylinder(18, 12, 12);
        translate([0,0,-0.01]) cylinder(19, 6, 6);
        translate([-25,c_cut/2,-c_cut+c_cut_h]) rotate([0,90]) cylinder(50, c_cut, c_cut);
        translate([2,8,0]) rotate([0,0,-20]) cube([m_cut, m_cut*1.6, 50], center=true);
        translate([-2,8,0]) rotate([0,0,20]) cube([m_cut, m_cut*1.6, 50], center=true);
    }    
}

//color([1,0,1,0.2]) sample();
main_tube(20,9, 8);