From c37fd834984997726d5f30b353a19a3eed3cfbd7 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Wed, 20 Jul 2016 18:51:58 +0000
Subject: introduce simple dual fanduct

---
diff --git a/fanduct.scad b/fanduct.scad
index 52aee0e..a17b261 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -3,7 +3,7 @@ extrusion_width=.5; layer_height=.2;		// print parameters
 
 epsilon=.005;		// for finer cuts
 
-type="circular"; 	// circular|3jets
+type="simple"; 	// circular|3jets
 ductshape="square"; 	// square|round
 dual=true;		// dual or single
 
@@ -104,9 +104,41 @@ module fanduct(type=type,ductshape=ductshape,dual=dual) {
     }
    }
   }
+  module dual_simple() {
+   for(my=[0,1]) mirror([0,my,0])
+   if(what=="in") {
+    sh = fanduct_w+2*fanduct_shell; sv = fanduct_h+2*fanduct_shell;
+    translate([0,nozzles_apart/2,0])
+    intersection() {
+     rotate_extrude($fn=smooth_f)
+      translate([fanduct_ir,0]) square([sh,sv]);
+     translate([-fanduct_ir-sh-1,0,-1])
+     cube(size=[fanduct_ir+sh+2,fanduct_ir+sh+2,sv+2]);
+    }
+    translate([-fanduct_ir-sh,-epsilon,0])
+    cube(size=[sh,nozzles_apart/2+2*epsilon,sv]);
+    translate([0,sh/2+fanduct_ir+nozzles_apart/2,0]) cylinder(d=sh,h=sv,$fn=36);
+   }else if(what=="out") {
+    sh = fanduct_w; sv = fanduct_h;
+    translate([0,nozzles_apart/2,fanduct_shell])
+    intersection() {
+     rotate_extrude($fn=smooth_f)
+      translate([fanduct_ir+fanduct_shell,0]) square([sh,sv]);
+     translate([-fanduct_ir-2*fanduct_shell-sh-1,-1,0])
+     cube(size=[fanduct_ir+2*fanduct_shell+sh+2,fanduct_ir+2*fanduct_shell+sh+2,sv]);
+    }
+    translate([-fanduct_ir-fanduct_shell-sh,-epsilon,fanduct_shell])
+    cube(size=[sh,nozzles_apart/2+2*epsilon,sv]);
+    translate([0,sh/2+fanduct_shell+fanduct_ir+nozzles_apart/2,fanduct_shell])
+    cylinder(d=sh,h=sv,$fn=36);
+   }
+  }
 
-  if(dual) dual();
-  else single();
+  if(dual) {
+   if(type=="simple")
+    dual_simple();
+   else dual();
+  }else single();
  }
 
  //	***	bumps for easier position adjustments in line with hotend
@@ -255,8 +287,32 @@ module fanduct(type=type,ductshape=ductshape,dual=dual) {
    }
   }
 
-  if(dual) dual(what);
-  else if(type=="circular") circus(what);
+  module dual_simple(what=what) {
+   for(my=[0:1]) mirror([0,my,0]) if(what=="in") {
+    difference() {
+     hull() {
+      translate([0,nozzles_apart/2+fanduct_ir+fanduct_shell+fanduct_w/2,0])
+      cylinder(d=fanduct_w+2*fanduct_shell,h=fanduct_h*2/3+2*fanduct_shell);
+      translate([0,nozzles_apart/2,-fanduct_elevation+fanduct_blowtarget])
+      rotate([0,90,0]) cylinder(r=.5,h=fanduct_w*2,center=true);
+     }
+     rr = 2*(fanduct_ir+fanduct_shell*2+fanduct_w+2);
+     translate([-rr/2,0,0]) mirror([0,0,1]) cube(size=[rr,rr,rr]);
+    }
+   }else if(what=="out") {
+    hull() {
+     translate([0,nozzles_apart/2+fanduct_ir+fanduct_shell+fanduct_w/2,fanduct_shell])
+     cylinder(d=fanduct_w,h=fanduct_h*2/3);
+     translate([0,nozzles_apart/2,-fanduct_elevation+fanduct_blowtarget])
+     rotate([0,90,0]) cylinder(d=.5,h=fanduct_w*2,center=true);
+    }
+   }
+  }
+
+  if(dual) {
+   if(type=="simple") dual_simple(what);
+   else dual(what);
+  }else if(type=="circular") circus(what);
   else if(type=="3jets") jets(what);
  }
 
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