dualism: the duct

1 files changed, 39 insertions, 3 deletions

diff --git a/fanduct.scad b/fanduct.scad
index 3e2a15e..b9689c9 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -30,2 +30,6 @@ hotend_clearance = heater_clearance;
 
+nozzles_apart = 18;		// distance between nozzles for dual hotend
+space_behind_nozzle = 15;	// space behind the nozzle where we're allowed to go
+				// without the fear of hitting carriage
+
 snapper_d = 8; snapper_overlap=0.2;	// snip snap
@@ -34,10 +38,15 @@ smooth_f = 120;
 
-type="3jets"; // "3jets" ; // circular|3jets
+type="circular"; 	// circular|3jets
 ductshape="square"; // square|round
+dual=true;		// dual or single
 
+to_midduct = fanduct_ir+fanduct_shell+fanduct_w/2;
+dual_spots = [ [+space_behind_nozzle, -(to_midduct+nozzles_apart/2)],
+	       [-         to_midduct, -(to_midduct+nozzles_apart/2)],
+	       [-         to_midduct, 0] ];
 
-module fanduct(type=type,ductshape=ductshape) {
-
+module fanduct(type=type,ductshape=ductshape,dual=dual) {
  //	***	duct is all around!
  module duct(what) {
+  module single() {
   if(what=="in") {
@@ -71,2 +80,29 @@ module fanduct(type=type,ductshape=ductshape) {
  }
+  module dual() {
+   module hulls(spots=dual_spots) {
+    for(my=[0,1]) mirror([0,my,0]) for(pn=[0:1:len(spots)-2]) hull() {
+     for(p=[spots[pn],spots[pn+1]]) translate(p) children();
+    }
+   }
+   if(what=="in") {
+    hulls() cylinder(d=fanduct_w+2*fanduct_shell,h=fanduct_h+2*fanduct_shell);
+   }else if(what=="out") {
+    sh = fanduct_w; sv = fanduct_h;
+    smax = max(sh,sv);
+    translate([0,0,fanduct_shell]) hulls() {
+     cylinder(d=fanduct_w,h=fanduct_h/2);
+     translate([0,0,fanduct_h/2])
+     scale([sh/smax,sh/smax,sv/smax])
+     intersection() {
+      sphere(d=smax,$fn=36);
+      translate([0,0,-1])
+      cylinder(d=smax+2,h=smax+2,$fn=36);
+     }
+    }
+   }
+  }
+
+  if(dual) dual();
+  else single();
+ }