work around the lack of air guides

intersection with empty airguides part isn't what one may expect it to be.

1 files changed, 3 insertions, 0 deletions

diff --git a/fanduct.scad b/fanduct.scad
index f4bb705..563920c 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -223,13 +223,16 @@ module fanduct(type=type) {
 
  difference() {
   parts("in");
   parts("out");
  }
  intersection() {
+  union() {
   output("airguides");
+   sphere(d=epsilon);
+  }
   union() {
    duct("in"); output("in"); intake("in");
   }
  }
 }