selectable round/square duct section

1 files changed, 21 insertions, 8 deletions

diff --git a/fanduct.scad b/fanduct.scad
index 53630a3..746f753 100644
--- a/fanduct.scad
+++ b/fanduct.scad
@@ -1,118 +1,131 @@
 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_l = 7;		// inlet length of protrusion (or depth of intrusion:))
 inlet_away = 15;	// how far away inlet is
 
 hotend_clearance = heater_clearance;
 
 snapper_d = 8; snapper_overlap=0.2;	// snip snap
 
 smooth_f = 120;
 
 type="3jets"; // "3jets" ; // circular|3jets
+ductshape="square"; // square|round
 
 
-module fanduct(type=type) {
+module fanduct(type=type,ductshape=ductshape) {
 
  //	***	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($fn=smooth_f)
-   translate([sh/2+fanduct_ir,sv/2])
-   scale([sh/smax,sv/smax])
-   circle(d=smax,$fn=4*smax);
+    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)
-   translate([sh/2+fanduct_shell+fanduct_ir,sv/2+fanduct_shell])
-   scale([sh/smax,sv/smax])
-   circle(d=smax,$fn=4*smax);
+    if(ductshape=="round")
+     translate([sh/2+fanduct_shell+fanduct_ir,sv/2+fanduct_shell])
+     scale([sh/smax,sv/smax])
+     circle(d=smax,$fn=4*smax);
+    else if(ductshape=="square")
+     translate([fanduct_ir+fanduct_shell,fanduct_shell])
+     union() {
+      square([fanduct_w,fanduct_h/2]);
+      translate([fanduct_w/2,fanduct_h-fanduct_w/2])
+      rotate([0,0,90]) circle(d=fanduct_w,$fn=36);
+     } 
   }
  }
 
  //	***	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+fanduct_shell+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]]);
       }
@@ -179,82 +192,82 @@ module fanduct(type=type) {
     for(i=[-1,0,1])
      translate([-fanduct_shell,
       (i+1)*(inlet_w-extrusion_width)/2,
      -inlet_away-fanduct_w/2])
      cube(size=[fanduct_shell,
       extrusion_width,
       inlet_l+fanduct_shell+inlet_away+fanduct_w/2]);
    }
    hull() {
     placeit() translate([-fanduct_shell,-inlet_w/2-fanduct_shell,0])
     cube(size=[inlet_h+2*fanduct_shell,inlet_w+2*fanduct_shell,fanduct_shell]);
     translate([-fanduct_ir-fanduct_shell-fanduct_w/2,0,0])
     translate([0,-inlet_w/2-fanduct_shell/2,0])
     cube(size=[1,inlet_w+fanduct_shell,fanduct_shell*2+fanduct_h]);
    }
   }else if(what=="out") {
    placeit() translate([fanduct_shell,-inlet_w/2+fanduct_shell,0])
    cube(size=[inlet_h-2*fanduct_shell,inlet_w-2*fanduct_shell,inlet_l+fanduct_shell+1]);
    hull() {
     placeit() translate([fanduct_shell,-inlet_w/2+fanduct_shell,0])
     cube(size=[inlet_h-2*fanduct_shell,inlet_w-2*fanduct_shell,fanduct_shell]);
     translate([-fanduct_ir-fanduct_shell-fanduct_w/2,0,fanduct_shell])
     translate([0,-inlet_w/2+fanduct_shell,0])
     cube(size=[1,inlet_w-2*fanduct_shell,fanduct_h]);
    }
   }
  }
 
  //	***	DUCT TAILS!!! WOO-OO! (every day they're out there making duct tails…)
  module tails(what) {
   if(what=="in") {
    for(mx=[0,1]) mirror([mx,0,0])
    translate([fanduct_ir+fanduct_shell+fanduct_w/2,0,fanduct_shell+fanduct_h/2])
    rotate([90,0,90])
    translate([0,0,-snapper_d/2])
    snapper(d=snapper_d,o=snapper_overlap,side=0,l=fanduct_h*3/2+fanduct_shell);
   }
  }
 
  module parts(what) {
   union() {
    duct(what);
    marks(what);
    output(what);
    intake(what);
    tails(what);
   }
  }
 
  difference() {
   parts("in");
   parts("out");
  }
  intersection() {
   union() {
    output("airguides");
    sphere(d=epsilon);
   }
   union() {
    duct("in"); output("in"); intake("in");
   }
  }
 }
 
-view="full"; // hcut|vcut|*
+view="vcut"; // hcut|vcut|*
 
 hinfinity=4*(fanduct_ir+fanduct_shell*2+fanduct_w+inlet_away);
 vinfinity=2*(fanduct_shell*2+fanduct_h+inlet_h);
 if(view=="hcut") {
  difference() {
   fanduct();
   translate([-hinfinity/2,-hinfinity/2,fanduct_shell+fanduct_h/2])
   cube(size=[hinfinity,hinfinity,vinfinity]);
  }
 }else if(view=="vcut") {
  difference() {
   fanduct();
   translate([-hinfinity/2,0,-vinfinity/2])
   cube(size=[hinfinity,hinfinity,vinfinity]);
  }
 }else fanduct();
 /* vim:set sw=1 ai: */