From 4bb6687a7d733a947943b67cf77c3963041c6fb0 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Wed, 22 Aug 2018 10:47:08 +0000
Subject: teardrop module

---
diff --git a/another.scad b/another.scad
index f4e8904..23243d9 100644
--- a/another.scad
+++ b/another.scad
@@ -92,6 +92,15 @@ module the_extruder(
  body_h = max(protrusion_h+bore_l,mount_screw_l-mount_depth+mount_screwhead_h+min_z_shell,ls_z*2);
  echo("mount depth",mount_depth);
 
+ module teardrop(r,d,h,center=false,angle=45) {
+  dd = d ? d : (2*r);
+  $fn = dd*fnd;
+  cylinder(d=dd,h=h,center=center);
+  if(angle>0) translate([0,0,center?-h/2:0])
+   rotate([0,0,angle])
+   cube(size=[d/2,d/2,h]);
+ }
+
  module mirrorleft() {
   mirror([left?0:1,0,0]) children();
  }
@@ -164,14 +173,11 @@ module the_extruder(
     }//union
  
     // filament path
-    place_idler() {
-     translate([-idler_d/2-idler_filament_offset,0,0]) rotate([90,0,0]) {
-      cylinder(d=filament_path_d,h=3*gearbox_d,center=true,$fn=30);
-      translate([0,-filament_path_d/2/sqrt(2),0]) rotate([0,0,45])
-      cube(size=[filament_path_d/2,filament_path_d/2,3*gearbox_d],center=true);
-     }//rotate translate
-     translate([-idler_d/2-idler_filament_offset,0,0])
-     rotate([90,0,0])
+    place_idler()
+    translate([-idler_d/2-idler_filament_offset,0,0])
+    rotate([90,0,0]) {
+     mirror([0,1,0])
+     teardrop(d=filament_path_d,h=3*gearbox_d,center=true);
      translate([0,0,
       sqrt(2)*(mount_d-pulley_d+lsd)/2
      ]) {
@@ -179,9 +185,9 @@ module the_extruder(
                h=filament_path_d,$fn=2*filament_path_d*fnd);
       translate([0,0,filament_path_d-epsilon])
       cylinder(d=2*filament_path_d,h=lsd,$fn=2*filament_path_d*fnd);
-     }
-    }//place_idler
-    
+     }//translate
+    }//rotate translate place_idler
+
     // idler space and mounting hole
     place_idler() {
      difference() {
@@ -310,10 +316,7 @@ module the_extruder(
    translate([0,0,mount_d/sqrt(2)/2+mount_screw_d+epsilon])
    rotate([0,0,180]) {
     pushfit(pf);
-    cylinder(d=filament_guide_d,h=gearbox_d,center=true,$fn=fnd*filament_guide_d);
-    translate([0,-filament_guide_d/2/sqrt(2),0])
-    rotate([0,0,45])
-    cube(size=[filament_guide_d/2,filament_guide_d/2,gearbox_d],center=true);
+    mirror([0,1,0]) teardrop(d=filament_guide_d,h=gearbox_d,center=true);
    }//rotate translate rotate translate rotate translate
    // pulley
    cylinder(d=pulley_d+pulley_d_clearance,h=body_h+1,$fn=fnd*(pulley_d+pulley_d_clearance));
--
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