$fn=90;
import("./spool_desicant_and_hygrometer_holder-container.stl", convexity=10);

D=54;
translate([D/2, D/2, 1]) difference() {
  cylinder(h=35, d=18);
  cylinder(h=35, d=15);
  translate([0,0,5])  for(i=[0:360/15:359]) rotate([0,0,i])  
    cube([20,1,25]);
}