/**
* hollow_out.scad
*
* @copyright Justin Lin, 2017
* @license https://opensource.org/licenses/lgpl-3.0.html
*
* @see https://openhome.cc/eGossip/OpenSCAD/lib-hollow_out.html
*
**/

module hollow_out(shell_thickness) {
    difference() {
        children();
        offset(delta = -shell_thickness) children();
    }
}