diff --git a/case/cheapino-top-left.scad b/case/cheapino-top-left.scad
index beab5e4..1a38282 100644
--- a/case/cheapino-top-left.scad
+++ b/case/cheapino-top-left.scad
@@ -40,13 +40,9 @@ mounting_hole_inserts();
 }
 
 
-
-
-// RJ45 socket
-
+// RJ45 socket cover
 translate([0,0,9.1])
 rotate([0,180,0])
- // RJ45 socket cover
   color("purple") {
     difference() {
       // x = front/back, y = left/right
@@ -68,7 +64,23 @@ rotate([0,180,0])
     }
 }
 
+// MCU cover
+translate([0,0,9.1])
+rotate([0,180,0])
+  color("gray") {
+    difference() {
+      // x = left/right, y = front/back
+      translate([29.5 - 2, 10.2 - 2, 4.1])
+        // MCU+hotswap height is 9mm
+        // I set 11, then I will use a difference to get 9mm
+        linear_extrude(11)
+        // width = left/right, height = front/back
+        // Add thickness of 4. 2 left 2 right.
+        square([19.5 + 4, 25 + 2]);
 
-
-
-
+      // repeat the difference() for initial mcu cutout
+      translate([29.2, 10.2, 4.1])
+        linear_extrude(9)
+        square([19.5, 25]);
+    }
+}