From c11d5b7e8f4b8f0e7a20d81dd813a21e19b705c3 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Mon, 30 May 2016 23:05:36 +0000
Subject: make the blow target adjustable

blow a bit below layer printed to target the neighborhood instead of
the very nozzle
---
diff --git a/fanduct.scad b/fanduct.scad
index 7fc1ff4..f4bb705 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -8,6 +8,7 @@ heater_l = 20;		// heatblock length
 nozzle_offset=4.5;	// nozzle offset from the edge of heatblock
 
 fanduct_elevation = 3;							// fanduct elevation above nozzle tip
+fanduct_blowtarget = -2;						// what to blow at
 fanduct_h = 6;								// inner height of the duct
 fanduct_w = 7;								// inner width of the duct
 fanduct_shell=1.2;							// shell thickness
@@ -81,10 +82,10 @@ module fanduct(type=type) {
     difference() {
      rotate_extrude($fn=smooth_f)
       polygon([
-       [0,-fanduct_elevation],
+       [0,-fanduct_elevation+fanduct_blowtarget+epsilon],
        [fanduct_ir+fanduct_shell,fanduct_shell+fanduct_h/2],
        [fanduct_ir+fanduct_shell+fanduct_w/2,0],
-       [0,-fanduct_elevation-.1]]);
+       [0,-fanduct_elevation+fanduct_blowtarget-epsilon]]);
      translate([0,0,-1])
      cylinder(r=hotend_clearance,h=fanduct_h+2*fanduct_shell+2,$fn=smooth_f);
      mirror([0,0,1])
@@ -94,10 +95,10 @@ module fanduct(type=type) {
    }else if(what=="out") {
     rotate_extrude($fn=smooth_f)
     polygon([
-     [0,-fanduct_elevation],
+     [0,-fanduct_elevation+fanduct_blowtarget+epsilon],
      [fanduct_ir+fanduct_shell+1,fanduct_h/2],
      [fanduct_ir+fanduct_w/2+fanduct_shell+1,fanduct_shell],
-     [0,-fanduct_elevation-.1]]);
+     [0,-fanduct_elevation+fanduct_blowtarget-epsilon]]);
    }else if(what=="airguides") {
     inr = fanduct_ir+fanduct_shell; our = inr+fanduct_w;
     union() {
--
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