From cb6cf91660f6cff67d35592e206c043e106d70a7 Mon Sep 17 00:00:00 2001
From: "dingfeng.wong" <dingfeng.wong@okg.com>
Date: Tue, 22 Jul 2025 00:40:03 +0800
Subject: [PATCH] a

---
 pcie.scad | 40 ++++++++++++++++++++++++++++++----------
 1 file changed, 30 insertions(+), 10 deletions(-)

diff --git a/pcie.scad b/pcie.scad
index d5c6d16..cfad590 100644
--- a/pcie.scad
+++ b/pcie.scad
@@ -4,6 +4,9 @@
 // Import PCIe holder functionality
 include <holder.scad>;
 
+// Import hexagon functionality for M3 nut holes
+include <hexagon.scad>;
+
 // Trapezium module - creates a centralized trapezoid shape (2D)
 // Parameters:
 //   base_width: width of the bottom edge
@@ -62,17 +65,34 @@ module trapezium_with_rectangle_2d(
 //trapezium_2d(base_width = 20, top_width = 10, height = 15);
 //translate([30, 0]) rectangle_2d(width = 8, height = 5);
 
-// Combined shape extruded to 3D:
+// Combined shape extruded to 3D with M3 nut hole:
 rect_height_val = 1.7;
 extrude_height = 15;
 
-linear_extrude(height = extrude_height) {
-    trapezium_with_rectangle_2d(
-        trap_base_width = 10.95, 
-        trap_top_width = 5.5, 
-        trap_height = 4.0,
-        rect_width = 6.3,
-        rect_height = rect_height_val,
-        rect_offset = -rect_height_val/2  // Half of rectangle height to center it at base edge
-    );
+difference() {
+    // Main extruded shape
+    linear_extrude(height = extrude_height) {
+        trapezium_with_rectangle_2d(
+            trap_base_width = 10.95, 
+            trap_top_width = 5.5, 
+            trap_height = 4.0,
+            rect_width = 6.3,
+            rect_height = rect_height_val,
+            rect_offset = -rect_height_val/2  // Half of rectangle height to center it at base edge
+        );
+    }
+    
+    // M3 nut hole on top face of trapezium (extended outward for clean cut)
+    translate([0, 4.0/2 + (m3_nut_height + 2)/2, extrude_height/2]) {
+        rotate([90, 0, 0]) {
+            hexagon_3d(m3_nut_width, m3_nut_height + 2);  // Extra height for clean cut
+        }
+    }
+    
+    // M3 bolt hole through entire trapezium
+    translate([0, 4.0/2, extrude_height/2]) {
+        rotate([90, 0, 0]) {
+            cylinder(h = 20, d = 3.2, center = true, $fn = 32);  // Long M3 clearance hole
+        }
+    }
 }
\ No newline at end of file