diff --git a/hexagon.scad b/hexagon.scad
new file mode 100644
index 0000000..785e061
--- /dev/null
+++ b/hexagon.scad
@@ -0,0 +1,63 @@
+// Hexagon Module Library
+// Various hexagon creation functions for OpenSCAD
+
+// === M3 Nut Hexagon Parameters ===
+m3_nut_width = 5.5;      // Distance across flats (M3 nut standard)
+m3_nut_height = 2.4;     // Standard M3 nut thickness
+m3_nut_diameter = 6.35;  // Distance across corners (calculated from width)
+
+// Hexagon module - creates a 2D hexagon
+// Parameters:
+//   width: distance across flats (flat-to-flat width)
+//   method: "circle" or "polygon" - different drawing methods
+module hexagon_2d(width, method = "circle") {
+    if (method == "circle") {
+        // Method 1: Using circle with 6 sides
+        // The radius needed for flat-to-flat distance
+        radius = width / (2 * cos(30));
+        circle(r = radius, $fn = 6);
+    } else {
+        // Method 2: Using polygon with calculated points
+        radius = width / (2 * cos(30));
+        points = [
+            for (i = [0:5]) 
+                [radius * cos(i * 60), radius * sin(i * 60)]
+        ];
+        polygon(points);
+    }
+}
+
+// 3D Hexagon module (extruded)
+// Parameters:
+//   width: distance across flats
+//   height: extrusion height
+//   method: "circle" or "polygon"
+module hexagon_3d(width, height, method = "circle") {
+    linear_extrude(height = height)
+        hexagon_2d(width, method);
+}
+
+// M3 Nut specific modules
+module m3_nut_2d() {
+    hexagon_2d(m3_nut_width);
+}
+
+module m3_nut_3d() {
+    hexagon_3d(m3_nut_width, m3_nut_height);
+}
+
+// M3 Nut with hole (complete nut)
+module m3_nut_with_hole() {
+    difference() {
+        hexagon_3d(m3_nut_width, m3_nut_height);
+        // M3 hole (3mm diameter, slightly larger for clearance)
+        translate([0, 0, -0.1])
+            cylinder(h = m3_nut_height + 0.2, d = 3.2, $fn = 32);
+    }
+}
+
+// Example usage (uncomment to test):
+//hexagon_2d(m3_nut_width);
+//translate([10, 0]) m3_nut_2d();
+//translate([0, 0, 5]) m3_nut_3d();
+//translate([10, 0, 5]) m3_nut_with_hole(); 
\ No newline at end of file
diff --git a/pcie.scad b/pcie.scad
index e98596a..4e21c3e 100644
--- a/pcie.scad
+++ b/pcie.scad
@@ -63,11 +63,12 @@ module trapezium_with_rectangle_2d(
 //translate([30, 0]) rectangle_2d(width = 8, height = 5);
 
 // Combined shape:
+rect_height_val = 1.7;
 trapezium_with_rectangle_2d(
-    trap_base_width = 10.3, 
-    trap_top_width = 6.3, 
-    trap_height = 4.3,
+    trap_base_width = 10.95, 
+    trap_top_width = 5.5, 
+    trap_height = 4.0,
     rect_width = 6.3,
-    rect_height = 1.7,
-    rect_offset = -0.85  // Half of rectangle height to center it at base edge
-);
+    rect_height = rect_height_val,
+    rect_offset = -rect_height_val/2  // Half of rectangle height to center it at base edge
+);
\ No newline at end of file