extruder_fan3.scad

duct_wall=1;
gap=6;
inner_radius=18;
outer_radius=inner_radius+gap;
height=14;
nozzle_height=6;
taper_angle=30;
skew=nozzle_height*tan(taper_angle);

top_height=height-nozzle_height;
mouth_width=12;
mouth_height=20;

pipe_length=40;
mount_width=5;
mount_depth=2.5;

module nozzle(radius)
difference(){
  union(){
    cylinder(r=radius,h=top_height);
    translate([0,0,top_height])
      cylinder(r1=radius,r2=radius-skew,h=nozzle_height);
  }
  cylinder(r=radius-duct_wall,h=top_height);
  translate([0,0,top_height])
      cylinder(r1=radius-duct_wall,r2=radius-skew-duct_wall,h=nozzle_height);
}


module duct(){
  difference(){
    nozzle(outer_radius);
     translate([-outer_radius+duct_wall,0,duct_wall])
        cube([(outer_radius-inner_radius),pipe_length,top_height-(2*duct_wall)]);
  }
  nozzle(inner_radius);
  
  difference(){
    union(){
      cylinder(r=outer_radius,h=duct_wall);
      difference(){
        translate([-outer_radius,0,0])
          cube([mouth_width,pipe_length,top_height]);   
        translate([-outer_radius+duct_wall,0,duct_wall])
          cube([mouth_width-(2*duct_wall),pipe_length,top_height-(2*duct_wall)]); 
        cylinder(r=outer_radius,h=top_height);
      }
    }
   
    cylinder(r=inner_radius,h=top_height);
  }

}

module heater_block(){
translate([0,0,nozzle_height])
  align([0,0,-1])
    cube([17.5,20,11.5],c=true);
}

//heater_block();

duct();