toolbox-inserts: UniversalJoint: describe the problem

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

diff --git a/toolbox-inserts.scad b/toolbox-inserts.scad
index 52f8ec7d0f758e29d4880f4d37f74cb1419ea07e..13a026ec0add12b64d4654c6aaac29d8435ac90c 100644 (file)
--- a/toolbox-inserts.scad
+++ b/toolbox-inserts.scad
@@ -163,6 +163,7 @@ module WellSurroundGapElevation(z_bottom_def, z_edge, z_wayhigh, gap) {
 //
 // SomethingPositive is the representation of the object to be retained
 // Retaining walls will be made up to its z=0.
+// z=0 should be its widest point.
 //
 // It can use $well_surround_cutout_only for parts that ought only to
 // be cut out and shouldn't generate walls.