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)

1 files changed, 12 insertions, 9 deletions

diff --git a/another.scad b/another.scad
index 297c1fc..ed18874 100644
--- a/another.scad
+++ b/another.scad
@@ -28,24 +28,25 @@ module the_extruder(
  filament_d = 1.75,
  filament_path_d = 2,
  filament_guide_d = 4,				// PTFE filament guide diameter
  // knob properties
  knob_h = 10,
  knob_bore_l = 4,
  knob_indent_d = 4,
  knob_indents = 12,
  // spring tensioner
  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,
  mount_screwhead_d=6, mount_screwhead_h=3,
  idler_screw_d = 3,
  idler_screwhead_d=6, idler_screwhead_h=3,
 
  pf = pushfit_embeddest,
  pf_shell = max(3*layer_height,3*extrusion_width),
  pf_smooth = true,
 
  // empty spaces
@@ -228,25 +229,25 @@ module the_extruder(
  
  module body() {
   difference() {
    union() {
     cylinder(d=gearbox_d,h=body_h,$fn=fnd*gearbox_d);
     // spring tensioner part
     translate([-gearbox_d/2,0,0]) hull() {
      translate([0,-longwing,ls_z])
      rotate([0,90,0])
      cylinder(d=lever_thickness,h=fsw,$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]);
     }//hull translate
     
     // pushfit bracket
     translate([0,0,filament_elevation])
     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:
      if(pf_smooth) {
@@ -352,65 +353,67 @@ module the_extruder(
    translate([-gearbox_d/2,-longwing,ls_z]) rotate([0,-90,0]) {
     mirror([0,0,1]) {
      translate([0,0,st_thickshell])
      hull() for(o=[0,spring_d]) translate([0,-o,0])
      rotate([0,0,30])
      cylinder(d=st_nut_d+st_nut_d_tolerance,h=st_nut_h+st_nut_h_tolerance,$fn=6);
      translate([0,0,-1]) cylinder(d=st_screw_d+st_screw_d_tolerance,h=fsw+2,$fn=fnd*(st_screw_d+st_screw_d_tolerance));
      bigd = spring_d+spring_d_clearance;
      hf = (bigd-st_screw_d-st_screw_d_tolerance)/2;
      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);
     }//mirror
    }//translate
 
    // 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];
+   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_thinshell+st_split_w_tolerance)/2+min_xy_shell+labelspace.y/2])
+    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
 
  }//body module
 
  module springpad() {
   smalld=st_screw_d+st_screw_d_tolerance+min_xy_shell;
   bigd = spring_d+spring_d_clearance/2;
   hf = (bigd-smalld)/2;
   h = hf*3.5;
   translate([-gearbox_d/2+st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell+1,-longwing,filament_elevation])
   rotate([0,90,0]) difference() {
    union() {
     cylinder(d1=smalld,d2=bigd,h=hf,$fn=fnd*bigd);
     translate([0,0,hf-epsilon])
     cylinder(d=bigd,h=h-hf,$fn=fnd*bigd);
     translate([0,0,h])
     sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
     l = body_h-ls_z;
-    w = st_thinshell;
-    hull() translate([0,-st_thinshell/2,0]) mirror([1,0,0]) {
+    w = st_split_w;
+    hull() translate([0,-st_split_w/2,0]) mirror([1,0,0]) {
      translate([0,0,w])
-     cube(size=[l,st_thinshell,w]);
-     cube(size=[l-w,st_thinshell,2*w]);
+     cube(size=[l,st_split_w,w]);
+     cube(size=[l-w,st_split_w,2*w]);
     }
    }
    translate([0,0,-epsilon])
    cylinder(d=st_screw_d+st_screw_d_tolerance,h=2*hf+epsilon,$fn=fnd*(st_screw_d+st_screw_d_tolerance));
   }
  }
 
  module knob() {
   ch = knob_indent_d/2;
   translate([0,0,body_h+epsilon]) {
    mirror([0,0,1]) translate([0,0,-epsilon]) {
     difference() {