poster-tube-lid: Add actual knob

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

diff --git a/poster-tube-lid.scad b/poster-tube-lid.scad
index cc4d297a2a9a532f95edd9e550c63d55b6013df7..4aea76df25ea8c48bd3930a5cd4fcee7ed84cb82 100644 (file)
--- a/poster-tube-lid.scad
+++ b/poster-tube-lid.scad
@@ -81,6 +81,7 @@ catch_stem_th = 3;
 
 catch_knob_dia = 6;
 catch_knob_above_gap = 8;
+catch_knob_height = 6;
 catch_pin_height = 7;
 
 catch_stem_below_gap = 1.0;
@@ -581,6 +582,12 @@ module CatchCoreProfile(){ ////toplevel
 module CatchCore(){ /////toplevel
   linear_extrude(height=catch_strap_thick, convexity=10)
     CatchCoreProfile();
+
+  translate(concat(cppB,[0])) hull(){
+    translate([0,0, catch_knob_height - catch_knob_dia/2])
+      sphere(r = catch_knob_dia/2);
+    cylinder(r = catch_knob_dia/2, h = 0.1);
+  }
 }
 
 module CatchPreDistort(){ /////toplevel