From 75fca0ac3c2b4e9a5d5bb49043abc9bc9e8b599c Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Fri, 31 Aug 2018 18:50:17 +0000
Subject: spring tensioner split width as a parameter

and conditional label (though probably without the change using empty
string would achieve more or less the same results)
---
diff --git a/another.scad b/another.scad
index 297c1fc..ed18874 100644
--- a/another.scad
+++ b/another.scad
@@ -37,6 +37,7 @@ module the_extruder(
  st_nut_d = 9, st_nut_h = 4,
  st_screw_d = 5,
  st_thickshell = 8*extrusion_width, st_thinshell = 2*extrusion_width,
+ st_split_w = 4*extrusion_width,
 
  // screw it
  mount_screw_d = 3.1, mount_screw_l = 20,
@@ -237,7 +238,7 @@ module the_extruder(
      cylinder(d=lever_thickness,h=fsw,$fn=fnd*lever_thickness);
      hh=body_h-ls_z;
      translate([0,0,ls_z])
-     mirror([0,1,0]) cube(size=[fsw,longwing+(st_thinshell+st_split_w_tolerance)/2+st_thickshell,body_h-ls_z]);
+     mirror([0,1,0]) cube(size=[fsw,longwing+(st_split_w+st_split_w_tolerance)/2+st_thickshell,body_h-ls_z]);
      hhh=ls_z;
      translate([0,0,0])
      mirror([0,1,0]) cube(size=[fsw,longwing-hhh+lever_thickness/sqrt(2),hhh+lever_thickness/2]);
@@ -361,8 +362,8 @@ module the_extruder(
      translate([0,0,st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell-epsilon]) {
       cylinder(d1=st_screw_d+st_screw_d_tolerance,d2=bigd,
        h=hf+epsilon, $fn=fnd*bigd);
-      translate([0,-(st_thinshell+st_split_w_tolerance)/2,0])
-      cube(size=[body_h-ls_z+1,st_thinshell+st_split_w_tolerance,fsw+1]);
+      translate([0,-(st_split_w+st_split_w_tolerance)/2,0])
+      cube(size=[body_h-ls_z+1,st_split_w+st_split_w_tolerance,fsw+1]);
      }//translate
      translate([0,0,st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell+hf-epsilon])
      cylinder(d=bigd,h=fsw+1,$fn=fnd*bigd);
@@ -372,12 +373,14 @@ module the_extruder(
    // label
    label_thickness = 2*layer_height;
    label_len = len(label);
-   labelspace = [gearbox_d/2-mount_screwhead_d/2-min_xy_shell,longwing-(mount_screwhead_d-st_thinshell-st_split_w_tolerance)/2-2*min_xy_shell-mount_d/2];
-   translate([0,0,body_h-label_thickness])
-   linear_extrude(height=label_thickness+epsilon,convexity=64)
-   translate([-mount_screwhead_d/2-min_xy_shell-labelspace.x/2,-longwing+(st_thinshell+st_split_w_tolerance)/2+min_xy_shell+labelspace.y/2])
-   mirror([left?0:1,0])
-   text(text=label,size=labelspace.x/label_len,halign="center",valign="center",font="Arial Black");
+   if(label_len) {
+    labelspace = [gearbox_d/2-mount_screwhead_d/2-min_xy_shell,longwing-(mount_screwhead_d-st_split_w-st_split_w_tolerance)/2-2*min_xy_shell];
+    translate([0,0,body_h-label_thickness])
+    linear_extrude(height=label_thickness+epsilon,convexity=64)
+    translate([-mount_screwhead_d/2-min_xy_shell-labelspace.x/2,-longwing+(st_split_w+st_split_w_tolerance)/2+min_xy_shell+labelspace.y/2])
+    mirror([left?0:1,0])
+    text(text=label,size=labelspace.x/label_len,halign="center",valign="center",font="Arial Black");
+   }//if(label_len)
 
   }//difference
 
@@ -397,11 +400,11 @@ module the_extruder(
     translate([0,0,h])
     sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
     l = body_h-ls_z;
-    w = st_thinshell;
-    hull() translate([0,-st_thinshell/2,0]) mirror([1,0,0]) {
+    w = st_split_w;
+    hull() translate([0,-st_split_w/2,0]) mirror([1,0,0]) {
      translate([0,0,w])
-     cube(size=[l,st_thinshell,w]);
-     cube(size=[l-w,st_thinshell,2*w]);
+     cube(size=[l,st_split_w,w]);
+     cube(size=[l-w,st_split_w,2*w]);
     }
    }
    translate([0,0,-epsilon])
--
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