octathingy: make top of capsule holder can be a big thicker

Octathingy_common.scad

@@ -198,7 +198,7 @@ module capsule_holder(ratio, transition, hollow = true) {
             }
         }
         // lip to insert holder into core
-        lip_d = 1.25 * wall;
+        lip_d = 1.5 * wall;
         translate([0, 0, hollow == false ? -3 : -lip_d]) {
             difference() {
                 // if not hollow make the ring longer to cut into core