make the blow target adjustable

blow a bit below layer printed to target the neighborhood instead of
the very nozzle

1 files changed, 5 insertions, 4 deletions

diff --git a/fanduct.scad b/fanduct.scad
index 7fc1ff4..f4bb705 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -5,12 +5,13 @@ epsilon=.005;		// for finer cuts
 
         heater_w = 16;  // heatblock width
         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
         fanduct_ir = sqrt(pow(heater_w/2,2)+pow(heater_l-nozzle_offset,2))+5;// inner radius
 
         jet_angle = 60;         // angular width of the jet
@@ -78,29 +79,29 @@ module fanduct(type=type) {
 
   module circus(what) {
    if(what=="in") {
     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])
      translate([0,0,-epsilon])
      cylinder(r=fanduct_ir+fanduct_shell+1,h=fanduct_elevation+.1+2);
     }
    }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() {
      for(my=[0,1]) mirror([0,my,0]) {
       guideline([
        [-our,inlet_w/6],