/*
 * Created by:
 * Thomas Buck <xythobuz@xythobuz.de> in May 2016
 *
 * Licensed under the Creative Commons - Attribution license.
 */

// -----------------------------------------------------------

diameter_outer_min = 10;
diameter_outer_max = 12;
height = 10;
diameter_inner_min = 2.8;
diameter_inner_max = 2.8;

$fn = 20;

// -----------------------------------------------------------

difference() {
    cylinder(d1 = diameter_outer_max, d2 = diameter_outer_min, h = height);
    cylinder(d = diameter_inner_max, d2 = diameter_inner_min, h = height);
}