1 files changed, 8 insertions, 6 deletions

diff --git a/fanduct.scad b/fanduct.scad
index 235c079..e16c5ae 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -48,18 +48,20 @@ module fanduct(type=type) {
   }
  }
 
          //     ***bumps for easier position adjustments in line with hotend
  module marks(what) {
   if(what=="in") {
-   for(y=[-1,1]) translate([0,y*(fanduct_ir+fanduct_shell+fanduct_w/2),fanduct_shell*2+fanduct_h])
-   rotate([90,0,0]) {
-    cylinder(r=fanduct_shell,h=fanduct_w,center=true,$fn=30);
-    for(z=[-1,1]) translate([0,0,z*fanduct_w/2])
-     sphere(r=fanduct_shell,$fn=30);
-   }
+   for(y=[-1,1])
+    hull() for(z=[0,-fanduct_shell-fanduct_h/2])
+     translate([0,y*(fanduct_ir+fanduct_shell+fanduct_w/2),fanduct_shell*2+fanduct_h+z])
+     rotate([90,0,0]) {
+      cylinder(r=fanduct_shell,h=fanduct_w,center=true,$fn=30);
+      for(z=[-1,1]) translate([0,0,z*fanduct_w/2])
+       sphere(r=fanduct_shell,$fn=30);
+     }
   }
  }
 
          //     ***output
  module output(what,type=type) {
   module guideline(xyxy) {