toolbox-inserts: use correct depth

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

diff --git a/toolbox-inserts.scad b/toolbox-inserts.scad
index 1a6fc24de29ed471eeef6c21c8dfac69d42aa8bf..c60d33fc1d79b243a071a4c0dd40f6c2f7ab5cc3 100644 (file)
--- a/toolbox-inserts.scad
+++ b/toolbox-inserts.scad
@@ -135,7 +135,7 @@ module WellSurround(
        AtFixingPositions(hull_group)
          render()
          metric_thread(diameter=fixing_thread_d, pitch=fixing_thread_pitch,
-                       length=fixing_depth, internal=true, leadin=3,
+                       length=$fixing_depth, internal=true, leadin=3,
                        test=$screw_test);
     }