include <C:\libs\OpenSCad\plot-function\plot_function.scad>   // https://github.com/rcolyer/plot-function

include <C:\libs\OpenSCad\BOSL2\gears.scad>

use <C:\libs\OpenSCad\closepoints\closepoints.scad>   // https://github.com/rcolyer/closepoints


module shell() {
translate([36,0,0]) CloseLoop([for (a=[0:360]) let(z=30+1.5*cos(8*a))
  [for (p=[[15.2,0,0], [15,0,0], [15,0,z], [15.2,0,z]]) Affine(RotZ(a), p)]]);
}

module shell2() {
translate([36,0,0]) CloseLoop([for (a=[0:360]) let(z=30+1.5*cos(8*a))
  [for (p=[[13.2,0,0], [13,0,0], [13,0,z], [13.2,0,z]]) Affine(RotZ(a), p)]]);
}

//hull() {
    shell();
    translate([0,0,-2]) shell2();
//}