toolbox-inserts: break out fixing_head_top_z

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/toolbox-inserts.scad b/toolbox-inserts.scad
index 3aec1b2227afddfde10ea6bad1d0460c337e4a06..c95f5ee5670587ed29dadb47f36f454eb20a89f7 100644 (file)
--- a/toolbox-inserts.scad
+++ b/toolbox-inserts.scad
@@ -42,6 +42,7 @@ $screw_test = false;
 // calculated
 
 wall_top_inner_bevel_ratio = 0.25; // XXXX?
+fixing_head_top_z = -below_plane_z + fixing_head_th;
 
 module DriverHandlePositive() { ////toplevel
   linextr_x_yz(0, driver_handle_total_l)
@@ -215,7 +216,7 @@ module FullPlate(right) { ////toplevel
     }
 
     union(){
-      linextr(-20, -below_plane_z + fixing_head_th) intersection() {
+      linextr(-20, fixing_head_top_z) intersection() {
         union() AtFixings()
          circle(r = fixing_head_d/2);
       }