pcie/hexagon.scad

// 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();