From f123d3acb5e918b6a21af0a65bba4dc0395c73f3 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Sun, 12 Aug 2018 21:20:15 +0000
Subject: finetune filament offset relative to the pulley

---
diff --git a/another.scad b/another.scad
index b80d0d0..a93d21a 100644
--- a/another.scad
+++ b/another.scad
@@ -18,6 +18,7 @@ module the_extruder(
  pulley_d = 11.5, pulley_h=10,
  pulley_elevation = 1,				// pulley elevation above the protrusion
  teeth_elevation = 7.5,				// distance from the bottom of the pulley to its teeth
+ filament_offset = (8.25-(3.0+3.5)/2) - 11.5/2 + 1.75/2,
  // idler properties
  idler_d = 9.5, idler_h = 4, idler_id = 3,	// idler dimensions: outer and inner diameters and height
  // spring properties
@@ -121,7 +122,7 @@ module the_extruder(
       cylinder(d=idler_screw_d,h=lever_thickness+2,center=true,$fn=30);
      }//place idler
      // filament path
-     rotate([0,0,45]) translate([pulley_d/2,0,0]) {
+     rotate([0,0,45]) translate([pulley_d/2+filament_offset,0,0]) {
       rotate([90,0,0]) cylinder(d=filament_d,h=gearbox_d*2,center=true,$fn=15);
       rotate([-90,0,0])
       translate([0,0,mount_d/sqrt(2)/2+mount_screw_d])
@@ -152,12 +153,12 @@ module the_extruder(
  
     // filament path
     place_idler() {
-     translate([-idler_d/2,0,0]) rotate([90,0,0]) {
+     translate([-idler_d/2+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/2,0,0])
+     translate([-idler_d/2+filament_offset,0,0])
      rotate([90,0,0])
      translate([0,0,
       sqrt(2)*(mount_d-pulley_d+lsd)/2
@@ -246,7 +247,7 @@ module the_extruder(
     
     // pushfit bracket
     translate([0,0,filament_elevation])
-    rotate([0,0,45]) translate([pulley_d/2,0,0])
+    rotate([0,0,45]) translate([pulley_d/2+filament_offset,0,0])
     rotate([-90,0,0])
     translate([0,0,mount_d/sqrt(2)/2+mount_screw_d-gearbox_d/2/*TODO:*/]) {
      pfbl = pf_h(pf)+gearbox_d/2; //TODO:
@@ -292,7 +293,7 @@ module the_extruder(
    }//for
    // pushfit
    translate([0,0,filament_elevation])
-   rotate([0,0,45]) translate([pulley_d/2,0,0])
+   rotate([0,0,45]) translate([pulley_d/2+filament_offset,0,0])
    rotate([-90,0,0])
    translate([0,0,mount_d/sqrt(2)/2+mount_screw_d+epsilon])
    rotate([0,0,180]) {
@@ -328,7 +329,7 @@ module the_extruder(
     (mount_d/sqrt(2)/2+mount_screw_d+pf_h(pf)+gearbox_d/2)
     /
     (
-     pulley_d/2-
+     pulley_d/2+filament_offset-
      (pf_d(pf)+2*pf_shell)/2/cos(30)
     )
    );
--
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