From 741e17207d7e98237eee3b2f1957ab21f067f153 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Fri, 03 Aug 2018 16:58:16 +0000
Subject: another: thicker shell to support spring nut

---
diff --git a/another.scad b/another.scad
index 7d2dfb3..efc553d 100644
--- a/another.scad
+++ b/another.scad
@@ -34,7 +34,7 @@ module the_extruder(
  // spring tensioner
  st_nut_d = 9, st_nut_h = 4,
  st_screw_d = 5,
- st_shell = 4*extrusion_width,
+ st_thickshell = 8*extrusion_width, st_thinshell = 4*extrusion_width,
 
  // screw it
  mount_screw_d = 3.1, mount_screw_l = 20,
@@ -209,17 +209,17 @@ module the_extruder(
       if(!tensioner) finger_indent(d=lever_thickness-1,r=15); else {
        if(debug) translate([0,-lever_thickness/2-1,-gearbox_d]) cube(size=[body_h/2+1,lever_thickness/2+1,gearbox_d+2]);
        mirror([0,0,1]) {
-	translate([0,0,st_shell])
+	translate([0,0,st_thickshell])
 	hull() for(o=[0,spring_d]) translate([0,-o,0])
 	rotate([0,0,30])
 	cylinder(d=st_nut_d,h=st_nut_h,$fn=6);
 	translate([0,0,-1]) cylinder(d=st_screw_d,h=fsw+2,$fn=fnd*st_screw_d);
 	bigd = spring_d+spring_d_clearance;
 	hf = (bigd-st_screw_d)/2;
-	translate([0,0,st_shell+st_nut_h+st_shell-epsilon])
+	translate([0,0,st_thickshell+st_nut_h+st_thinshell-epsilon])
 	cylinder(d1=st_screw_d,d2=bigd,
 	 h=hf+epsilon, $fn=fnd*bigd);
-	translate([0,0,st_shell+st_nut_h+st_shell+hf-epsilon])
+	translate([0,0,st_thickshell+st_nut_h+st_thinshell+hf-epsilon])
 	cylinder(d=bigd,h=fsw+1,$fn=fnd*bigd);
        }
       }
@@ -335,7 +335,7 @@ module the_extruder(
   smalld=st_screw_d+2*extrusion_width;
   bigd = spring_d+spring_d_clearance/2;
   hf = (bigd-smalld)/2;
-  translate([-gearbox_d/2+st_shell+st_nut_h+st_shell+smalld,-longwing,filament_elevation])
+  translate([-gearbox_d/2+st_thickshell+st_nut_h+st_thinshell+1,-longwing,filament_elevation])
   rotate([0,90,0]) difference() {
    union() {
     cylinder(d1=smalld,d2=bigd,h=hf,$fn=fnd*bigd);
--
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