From c1cf1db2fe6d4bb3450f6f94e806eca04955be3b Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Mon, 13 Jun 2016 19:50:14 +0000
Subject: increase effective hotend clearance

so that it corresponds to theoretical
---
diff --git a/fanduct.scad b/fanduct.scad
index 6407a96..49ab4c2 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -220,6 +220,7 @@ module fanduct(type=type,ductshape=ductshape,dual=dual) {
     }
    }
    if(what=="in") {
+    cfn= 4; // clearance cutout $fn
     difference() {
      hulls() {
       cylinder(d=fanduct_w+2*fanduct_shell,h=2*fanduct_shell+fanduct_h/2);
@@ -228,7 +229,7 @@ module fanduct(type=type,ductshape=ductshape,dual=dual) {
      translate([0,0,epsilon]) hull() for(my=[0:1]) mirror([0,my,0]) for(s=dual_spots) translate(s)
       mirror([0,0,1]) cylinder(d=fanduct_w+2*fanduct_shell+2,h=fanduct_elevation-fanduct_blowtarget+1);
      for(s=[-1,1]) translate([0,s*nozzles_apart/2,-1])
-      rotate([0,0,45]) cylinder(r=hotend_clearance,h=fanduct_h+2*fanduct_shell+2,$fn=4);
+      rotate([0,0,180/cfn]) cylinder(r=hotend_clearance/cos(180/cfn),h=fanduct_h+2*fanduct_shell+2,$fn=cfn);
     }
    }else if(what=="out") {
     hulls() {
--
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