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
@@ -1,119 +1,155 @@
 use <snapper.scad>;
         extrusion_width=.5; layer_height=.2;    // print parameters
 
         epsilon=.005;   // for finer cuts
 
 function hypothenuse(a,b) = sqrt(pow(a,2)+pow(b,2));
 
 silicone_shell = 2;
 heater_clearance = max(
                 hypothenuse(16/2     +silicone_shell, 20-4.5 +silicone_shell),// E3D v6
                 hypothenuse(11.5-4.5 +silicone_shell, 15.5   +silicone_shell)// E3D volcano
 );
 
         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 = heater_clearance+5;                                // inner radius
 
         jet_angle = 60-2;       // angular width of the jet
 
         inlet_w = 12.5;         // inlet width
         inlet_h = 17;   // inlet height
         inlet_short_l = 7;// inlet length of protrusion (or depth of intrusion:))
         inlet_away = 15;// how far away inlet is
 
 inlet_long_l = inlet_short_l+inlet_h;
 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
 
 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") {
    sh = fanduct_w+2*fanduct_shell; sv = fanduct_h+2*fanduct_shell;
    smax = max(sh,sv);
    rotate_extrude($fn=smooth_f)
     if(ductshape=="round")
      translate([sh/2+fanduct_ir,sv/2])
      scale([sh/smax,sv/smax])
      circle(d=smax,$fn=4*smax);
     else if(ductshape=="square")
      translate([fanduct_ir,0])
      square([sh,sv]);
   }else if(what=="out") {
    sh = fanduct_w; sv = fanduct_h;
    smax = max(sh,sv);
    rotate_extrude($fn=smooth_f)
     if(ductshape=="round")
      translate([sh/2+fanduct_shell+fanduct_ir,sv/2+fanduct_shell])
      scale([sh/smax,sv/smax])
      circle(d=smax,$fn=4*smax);
     else if(ductshape=="square")
      translate([fanduct_ir+fanduct_shell,fanduct_shell])
      union() {
       square([sh,sv/2]);
       translate([sh/2,sv/2])
       scale([sh/smax,sv/smax])
       circle(d=smax,$fn=36);
      } 
   }
  }
+  module dual() {
+   module hulls(spots=dual_spots) {
+    for(my=[0,1]) mirror([0,my,0]) for(pn=[0:1:len(spots)-2]) hull() {
+     for(p=[spots[pn],spots[pn+1]]) translate(p) children();
+    }
+   }
+   if(what=="in") {
+    hulls() cylinder(d=fanduct_w+2*fanduct_shell,h=fanduct_h+2*fanduct_shell);
+   }else if(what=="out") {
+    sh = fanduct_w; sv = fanduct_h;
+    smax = max(sh,sv);
+    translate([0,0,fanduct_shell]) hulls() {
+     cylinder(d=fanduct_w,h=fanduct_h/2);
+     translate([0,0,fanduct_h/2])
+     scale([sh/smax,sh/smax,sv/smax])
+     intersection() {
+      sphere(d=smax,$fn=36);
+      translate([0,0,-1])
+      cylinder(d=smax+2,h=smax+2,$fn=36);
+     }
+    }
+   }
+  }
+
+  if(dual) dual();
+  else single();
+ }
 
          //     ***bumps for easier position adjustments in line with hotend
  module marks(what) {
   if(what=="in") {
    for(y=[-1,1])
     hull() for(z=[0,-fanduct_shell-fanduct_h/2])
      translate([0,y*(fanduct_ir+fanduct_shell+fanduct_w/2),fanduct_shell*2+fanduct_h+z])
      rotate([90,0,0]) {
       cylinder(r=fanduct_shell,h=fanduct_w,center=true,$fn=30);
       for(z=[-1,1]) translate([0,0,z*fanduct_w/2])
        sphere(r=fanduct_shell,$fn=30);
      }
   }
  }
 
          //     ***output
  module output(what,type=type) {
   module guideline(xyxy) {
    module pin(xy) {
     translate([xy[0],xy[1],0])
     cylinder(d=2*extrusion_width,h=2*fanduct_shell+inlet_h,$fn=6);
    }
    xyxyxy=concat(xyxy,[[0,0]]);
    for(i=[0:1:len(xyxyxy)-2])
     hull() for(j=[i,i+1]) pin(xyxyxy[j]);
   }
 
   module circus(what) {
    if(what=="in") {
     difference() {
      rotate_extrude($fn=smooth_f)
       polygon([
        [0,-fanduct_elevation+fanduct_blowtarget+epsilon],
        [fanduct_ir+fanduct_shell,fanduct_shell+fanduct_h/2],
        [fanduct_ir+fanduct_shell+fanduct_w/2,0],
        [0,-fanduct_elevation+fanduct_blowtarget-epsilon]]);
      translate([0,0,-1])
      cylinder(r=hotend_clearance,h=fanduct_h+2*fanduct_shell+2,$fn=smooth_f);
      mirror([0,0,1])
      translate([0,0,-epsilon])
      cylinder(r=fanduct_ir+2*fanduct_shell+fanduct_w+1,h=fanduct_elevation+.1+2);
     }
    }else if(what=="out") {
     rotate_extrude($fn=smooth_f)
     polygon([
      [0,-fanduct_elevation+fanduct_blowtarget+epsilon],
      [fanduct_ir+fanduct_shell+1,fanduct_h/2],
      [fanduct_ir+fanduct_w/2+fanduct_shell+1,fanduct_shell],