inner_radius = 11;
radius = 12.25;

height = 3;
inner_height = 5;

difference() {
    translate([0, 0, 0.01])
        cylinder(r=radius+1.5, h=inner_height+height-0.04);
    union() {
        translate([0, 0, inner_height-0.01]) cylinder(r=radius, h=height);
        cylinder(r=inner_radius, h=inner_height);
    }
}