diff --git a/pcie.scad b/pcie.scad
index 6d11c6c..b4fceaf 100644
--- a/pcie.scad
+++ b/pcie.scad
@@ -4,140 +4,29 @@
 // Import PCIe holder functionality
 include <holder.scad>;
 
-// === 2020 Extrusion Insert Parameters ===
-extrusion_2020_outer = 20;      // 2020 extrusion outer dimension
-extrusion_2020_inner = 16.2;    // Internal cavity dimension
-extrusion_2020_slot_width = 6;  // T-slot opening width
-extrusion_2020_slot_depth = 1.8; // T-slot depth from outer edge
-tab_clearance = 0.2;            // Clearance for tabs to fit in T-slots
-insert_clearance = 0.1;         // General clearance for the insert body
-
-// === 2020 Extrusion Insert Module ===
-module extrusion_2020_insert_2d(
-    with_tabs = true,           // Include tabs for T-slot engagement
-    tab_width = 4,              // Width of each tab
-    tab_thickness = 1.6,        // Thickness of tabs (fits in T-slot depth)
-    insert_width = 15.8,        // Width of main insert body (with clearance)
-    insert_height = 15.8,       // Height of main insert body (with clearance)
-    tab_positions = [0.25, 0.75], // Relative positions of tabs (0-1)
-    corner_radius = 0.5         // Corner radius for smoother printing
-) {
+// Trapezium module - creates a centralized trapezoid shape
+// Parameters:
+//   base_width: width of the bottom edge
+//   top_width: width of the top edge  
+//   height: height of the trapezium
+//   depth: depth/thickness of the shape (default 1)
+module trapezium(base_width, top_width, height, depth = 1) {
+    // Calculate the difference in width
+    width_diff = base_width - top_width;
     
-    // Calculate dimensions
-    effective_insert_width = insert_width;
-    effective_insert_height = insert_height;
+    // Create the trapezoid points (centered)
+    points = [
+        [-base_width/2, -height/2],  // bottom left
+        [base_width/2, -height/2],   // bottom right
+        [top_width/2, height/2],     // top right
+        [-top_width/2, height/2]     // top left
+    ];
     
-    // Main insert body
-    difference() {
-        // Create main rectangular body with rounded corners
-        offset(r = corner_radius) 
-            offset(r = -corner_radius)
-                square([effective_insert_width, effective_insert_height], center = true);
-        
-        // Optional cutouts can be added here for weight reduction or specific features
+    // Extrude the 2D trapezoid to create 3D shape
+    linear_extrude(height = depth, center = true) {
+        polygon(points);
     }
-    
-    // Add tabs for T-slot engagement if requested
-    if (with_tabs) {
-        // Top tabs
-        for (pos = tab_positions) {
-            translate([
-                (pos - 0.5) * effective_insert_width,
-                effective_insert_height/2 + tab_thickness/2
-            ])
-                square([tab_width, tab_thickness], center = true);
-        }
-        
-        // Bottom tabs
-        for (pos = tab_positions) {
-            translate([
-                (pos - 0.5) * effective_insert_width,
-                -(effective_insert_height/2 + tab_thickness/2)
-            ])
-                square([tab_width, tab_thickness], center = true);
-        }
-        
-        // Left tabs
-        for (pos = tab_positions) {
-            translate([
-                -(effective_insert_width/2 + tab_thickness/2),
-                (pos - 0.5) * effective_insert_height
-            ])
-                square([tab_thickness, tab_width], center = true);
-        }
-        
-        // Right tabs
-        for (pos = tab_positions) {
-            translate([
-                effective_insert_width/2 + tab_thickness/2,
-                (pos - 0.5) * effective_insert_height
-            ])
-                square([tab_thickness, tab_width], center = true);
-        }
-    }
-    
-    // Display insert specifications
-    echo("=== 2020 Extrusion Insert Specifications ===");
-    echo(str("Insert dimensions: ", effective_insert_width, "mm x ", effective_insert_height, "mm"));
-    echo(str("Tab width: ", tab_width, "mm"));
-    echo(str("Tab thickness: ", tab_thickness, "mm"));
-    echo(str("Tabs enabled: ", with_tabs));
-    echo(str("Tab positions: ", tab_positions));
-    echo("=== End Insert Specifications ===");
 }
 
-// === Function to create 3D insert from 2D profile ===
-module extrusion_2020_insert_3d(
-    length = 50,                // Length to extrude the insert
-    with_tabs = true,
-    tab_width = 4,
-    tab_thickness = 1.6,
-    insert_width = 15.8,
-    insert_height = 15.8,
-    tab_positions = [0.25, 0.75],
-    corner_radius = 0.5
-) {
-    linear_extrude(height = length)
-        extrusion_2020_insert_2d(
-            with_tabs = with_tabs,
-            tab_width = tab_width,
-            tab_thickness = tab_thickness,
-            insert_width = insert_width,
-            insert_height = insert_height,
-            tab_positions = tab_positions,
-            corner_radius = corner_radius
-        );
-}
-
-// === Usage Examples ===
-
-// Generate the PCIe riser holder using imported functionality
-pcie_riser_holder(
-    thickness = thickness,
-    hole_diameter = hole_diameter,
-    margin_x = margin_x,
-    holder_width = holder_width,
-    first_spacing = first_hole_spacing,
-    second_spacing = second_hole_spacing,
-    third_spacing = third_hole_spacing,
-    show_preview_holes = false  // Set to true to see hole positions in preview
-);
-
-// Uncomment below to generate a 2020 extrusion insert instead
-// Example 1: 2D profile for manual extrusion
-//extrusion_2020_insert_2d();
-
-// Example 2: 3D insert with 50mm length
-//extrusion_2020_insert_3d(length = 50);
-
-// Example 3: Insert without tabs (for loose fit)
-//extrusion_2020_insert_3d(length = 30, with_tabs = false);
-
-// Example 4: Custom tab configuration
-//extrusion_2020_insert_3d(
-//    length = 40,
-//    tab_width = 6,
-//    tab_positions = [0.2, 0.8],
-//    insert_width = 15.5,
-//    insert_height = 15.5
-//);
+// Example usage (uncomment to test):
+trapezium(base_width = 20, top_width = 10, height = 15, depth = 3);