work around the lack of air guides

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

1 files changed, 4 insertions, 1 deletions

diff --git a/fanduct.scad b/fanduct.scad
index f4bb705..563920c 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -217,25 +217,28 @@ module fanduct(type=type) {
    marks(what);
    output(what);
    intake(what);
    tails(what);
   }
  }
 
  difference() {
   parts("in");
   parts("out");
  }
  intersection() {
-  output("airguides");
+  union() {
+   output("airguides");
+   sphere(d=epsilon);
+  }
   union() {
    duct("in"); output("in"); intake("in");
   }
  }
 }
 
 view="full"; // hcut|vcut|*
 
 hinfinity=4*(fanduct_ir+fanduct_shell*2+fanduct_w+inlet_away);
 vinfinity=2*(fanduct_shell*2+fanduct_h+inlet_h);
 if(view=="hcut") {
  difference() {