diff --git a/amp_case.py b/amp_case.py
index 7744539..6298312 100644
--- a/amp_case.py
+++ b/amp_case.py
@@ -10,13 +10,15 @@ from svgpathtools import svg2paths
 import cadquery as cq
 import cqmore
 
-amp_bottom_height = 16 # how tall the pcb is
+amp_bottom_height = 16  # how tall the pcb is
 battery_width = 26
 battery_height = 17
 amp_width = 50
 amp_length = 60
 amp_height = battery_height + amp_bottom_height + 4
 
+side_width = 3
+
 result = Workplane().box(amp_length, amp_width, 2)
 
 result = (
@@ -24,7 +26,13 @@ result = (
     .center(0, -(amp_width / 2))
     .line(0, amp_width, forConstruction=True)
     .vertices()
-    .box(amp_length, 3, amp_height)
+    .box(amp_length, side_width, amp_height)
+)
+
+result = (
+    result.workplane(offset=(amp_height / 2) + side_width * 2)
+    .center(0, amp_width / 2)
+    .box(amp_length, amp_width + side_width, side_width)
 )
 
 try: