Fixed bug closing holes in cap

enclosure/box.scad

@@ -115,6 +115,8 @@ module box() {
 
 // Upper cap lip
 module lip() {
+    difference() {
+        union() {
             // Lip support
             translate([0, 0, box_cut_height + 5]) {
                 intersection() {
@@ -127,9 +129,7 @@ module lip() {
                 }
             }
            
-    
             // Chamfered lip
-    difference() {
             for (i = [0:10]) {
                 translate([0, 0, box_cut_height - i * 0.5]) {
                     intersection() {
@@ -145,6 +145,7 @@ module lip() {
                     }
                 }
             }
+        }
         
 
         // Leave space for screws standoffs near curved edges