dualism: the duct

1 files changed, 66 insertions, 30 deletions

diff --git a/fanduct.scad b/fanduct.scad
index 3e2a15e..b9689c9 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -1,166 +1,202 @@
 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
-ductshape="square"; // square|round
-
+type="circular"; 	// circular|3jets
+ductshape="square"; 	// square|round
+dual=true;		// dual or single
 
-module fanduct(type=type,ductshape=ductshape) {
+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,dual=dual) {
  //	***	duct is all around!
  module duct(what) {
-  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])
+  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=36);
-     } 
+      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],
      [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],
        [-inr*sin(60),inr*cos(60)]
       ]);
       a0=30; as=15; a1=180;
       for(a=[a0+as:as:a1]) {
        f = as/(a1-a+as);
        rotate([0,0,a]) guideline([[-inr-fanduct_w*f,0]]);
       }
       guideline([
        [-our+fanduct_w*cos(30)*3/4,fanduct_w*sin(30)*3/4],
        [-inr*cos(10),inr*sin(10)]
       ]);
      }
     }/*union*/
    }/*airguides*/
   }
 
   module jets(what) {
    od = fanduct_h*2/3+fanduct_shell;
    md = fanduct_ir+fanduct_shell+fanduct_w/2;
    jww = 2*md*sin(jet_angle/2);
    difference() {
     for(a=[0:120:359]) rotate([0,0,a]) {
      if(what=="in") {
       hull() {
        intersection() {
 	translate([md-fanduct_w/2,-jww/2,0])
 	cube(size=[fanduct_shell+fanduct_w/2,jww,od]);
 	duct(what=what);
        }
        translate([0,0,-fanduct_elevation]) sphere(r=.5);
       }
      }else if(what=="out") {
       hull() {
        intersection() {
 	translate([md-fanduct_w/2,-jww/2+fanduct_shell,fanduct_shell])
 	cube(size=[fanduct_w/2,jww-2*fanduct_shell,od-2*fanduct_shell]);
 	duct(what=what);
        }
        translate([0,0,-fanduct_elevation]) sphere(r=.2);
       }