diff --git a/case_numpad.scad b/case_numpad.scad
index e5f06c2..fba4c9b 100644
--- a/case_numpad.scad
+++ b/case_numpad.scad
@@ -24,6 +24,8 @@ rim_extra_height = 3.0;
 
 pillar_dia = 5; 
 
+back_hole_dia = 15.5;
+
 case_w = plate_w + (wall_thickness * 2) + (clearance * 2) - 2;
 case_h = (plate_h * cos(case_angle)) + (wall_thickness * 2) + (clearance * 2) - 2 * cos(case_angle);
 
@@ -45,6 +47,20 @@ clip_width = 10.0;
 clip_depth = 1.5;
 clip_height = 1.5; 
 
+module back_wall_hole() {
+    // X position: between holder and right wall
+    holder_right_edge = (case_w / 2) + (holder_x / 2) + holder_wall;
+    inner_right_wall = case_w - wall_thickness;
+    x_pos = (holder_right_edge + inner_right_wall) / 2;
+
+    // Z position: bottom of the hole touching the bottom of the case
+    z_pos = floor_thickness + (back_hole_dia / 2);
+
+    translate([x_pos, case_h - wall_thickness - 1, z_pos])
+        rotate([-90, 0, 0])
+            cylinder(d = back_hole_dia, h = wall_thickness + 2, $fn = 64);
+}
+
 module controller_holder() {
     x_pos = (case_w / 2) - (holder_x / 2) - holder_wall;
     y_inner_wall = case_h - wall_thickness;
@@ -145,5 +161,6 @@ module case_full_geometry() {
 difference() {
     case_full_geometry();
     usb_cutout();
+    back_wall_hole();
 }
 controller_holder();
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