It works!

smd_magazine.scad

@@ -13,6 +13,10 @@ magnet_diameter=3;
 magnet_thickness=1;
 magnet_tolerance=0.2;
 
+// hub hole size
+hub_hole_size=15;
+hub_size_tweak=1;
+
 // DIN rail mount
 use_din_mount=1; // 0 to omit
 
@@ -51,7 +55,7 @@ module body()
         translate([0, overall_depth/2, overall_height/2])
         rotate([0, 90, 0])
         rotate_extrude($fn=360) // chamfer tool
-            polygon([[0, 0], [8, 0], [7.5, .5], [8, 1], [0, 1]]);
+            polygon([[0, 0], [hub_hole_size/2+.5, 0], [hub_hole_size/2, .5], [hub_hole_size/2+.5, 1], [0, 1]]);
 
         // parts window on top
         translate([1+tolerance/2, 8, overall_height-1-tape_thickness-tolerance])
@@ -172,26 +176,30 @@ module lid()
 {
     difference()
     {
-        union()
+        union() // basic disc and hub
         {
             cylinder(d=overall_depth-5, h=1, $fn=360);    
-            cylinder(d=15, h=overall_width, $fn=360);    
+            cylinder(d=hub_hole_size+hub_size_tweak, h=overall_width, $fn=360);    
         }
         cylinder(d=12, h=overall_width, $fn=360);
-        translate([-1, -8, 1])    
+
+        translate([-1, -8, 1]) // cut hub into pieces for flexibility   
             cube([2, 16, overall_width]);
         translate([-8, -1, 1])
             cube([16, 2, overall_width]);
+
         translate([0, 0, overall_width-1])
         rotate_extrude($fn=360) // inverse of the previous chamfer tool
-            polygon([[9, 0], [7.5, 0], [7, .5], [7.5, 1], [9, 1]]);
+            polygon([[overall_depth/2, 0], [(hub_hole_size+hub_size_tweak)/2, 0], [(hub_hole_size+hub_size_tweak)/2-.5, .5], [(hub_hole_size+hub_size_tweak)/2, 1], [overall_depth/2, 1]]);
+
+        // cut out windows
         rotate_extrude(angle=90, $fn=360)
-            polygon([[10, 0], [(overall_depth-5)/2-5, 0], [(overall_depth-5)/2-5, 1], [10, 1], [10, 0]]);
+            polygon([[(hub_hole_size+hub_size_tweak+5)/2, 0], [(overall_depth-5)/2-5, 0], [(overall_depth-5)/2-5, 1], [(hub_hole_size+hub_size_tweak+5)/2, 1], [(hub_hole_size+hub_size_tweak+5)/2, 0]]);
         rotate([0,0,120])
         rotate_extrude(angle=90, $fn=360)
-            polygon([[10, 0], [(overall_depth-5)/2-5, 0], [(overall_depth-5)/2-5, 1], [10, 1], [10, 0]]);
+            polygon([[(hub_hole_size+hub_size_tweak+5)/2, 0], [(overall_depth-5)/2-5, 0], [(overall_depth-5)/2-5, 1], [(hub_hole_size+hub_size_tweak+5)/2, 1], [(hub_hole_size+hub_size_tweak+5)/2, 0]]);
         rotate([0,0,240])
         rotate_extrude(angle=90, $fn=360)
-            polygon([[10, 0], [(overall_depth-5)/2-5, 0], [(overall_depth-5)/2-5, 1], [10, 1], [10, 0]]);
+            polygon([[(hub_hole_size+hub_size_tweak+5)/2, 0], [(overall_depth-5)/2-5, 0], [(overall_depth-5)/2-5, 1], [(hub_hole_size+hub_size_tweak+5)/2, 1], [(hub_hole_size+hub_size_tweak+5)/2, 0]]);
     }
 }