FunnelLine -> FunnelFin; First working version

HeatSink.scad

@@ -208,16 +208,26 @@ module funnel2D() {
 
 
 
-module funnelLine(y){
+// ff = funnel fin
+ff_str = hs_fin_w0;  // strength
 
-  translate([0, -y/2, 0]) square([x, y]);
-  translate([0, 0, 0]) roundTri((x*9) * (y/hs_w), y, 5);
+module funnelFin(y){
 
+  module _fF(y) {
+    translate([0, -y/2, 0]) square([x, y]);
+    translate([0, 0, 0]) roundTri((x*9) * (y/hs_w), y, 5);
+  }
+  
+  
+  difference() {
+    _fF(y + ff_str/2);
+    _fF(y - ff_str/2);
+  }
 }
 
 
 
-color([0, 0, 1.0, 1.0]) translate([0, 0, 1]) linear_extrude(1) funnelLine(hs_w - 5);
+color([0, 0, 1.0, 1.0]) translate([0, 0, 1]) linear_extrude(1) funnelFin(hs_w - 5);
 
 
 module  funnel() {