toolbox-inserts: rails, improve demo

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

diff --git a/toolbox-inserts.scad b/toolbox-inserts.scad
index 71db9e403125a4efadacb20e75fa238ef229dc6a..1cbf7d650e349cdfb9ae0659c80bfcc7c052b4c1 100644 (file)
--- a/toolbox-inserts.scad
+++ b/toolbox-inserts.scad
@@ -352,6 +352,9 @@ module WellSurroundGapElevationDemo() { ////toplevel
 }
 
 module RailMountElevationDemo() { ////toplevel
+  color("blue")  translate([0,0, -10])
+    rectfromto([ -20, -below_plane_z ],
+              [  20, 0 ]);
   color("yellow") translate([0,0, -5]) RailMountCutoutElevation();
   color("purple") translate([0,0,  5]) RailMountPositiveElevation();
 }