$fn = 64;

// --- Parameters ---
// Designed for standard 1-inch pegboard (1/4" holes)
peg_spacing = 25.4;        // Standard 1-inch pegboard spacing
peg_diameter = 5.8;        // Fits standard 1/4-inch (6.35mm) holes
board_thickness = 5.0;     // Pegboard thickness
base_width = 16.0;         // Width of the mounting plate
base_thickness = 8.0;      // Total thickness of the front block

// Mounting Interface Parameters
hole_diameter = 3.4;       // M3 screw hole (with tolerance)
nut_width_flats = 6.0;     // M3 hex nut width across flats (with tolerance)
nut_depth = 3.0;           // Depth for captured nut

module pegboard_mount() {
    difference() {
        union() {
            // Main Base Block
            hull() {
                translate([0, 0, 0]) cylinder(d=base_width, h=base_thickness);
                translate([0, -peg_spacing, 0]) cylinder(d=base_width, h=base_thickness);
            }

            // Top Locking Peg (Shaft)
            translate([0, 0, -board_thickness - peg_diameter])
                cylinder(d=peg_diameter, h=board_thickness + peg_diameter + 0.1);

            // Top Locking Lip (Rounded for easy insertion)
            translate([0, 0, -board_thickness - peg_diameter/2])
                hull() {
                    sphere(d=peg_diameter);
                    translate([0, peg_diameter * 0.8, 0]) sphere(d=peg_diameter);
                }

            // Bottom Stabilizing Peg (Shaft)
            translate([0, -peg_spacing, -board_thickness])
                cylinder(d=peg_diameter, h=board_thickness + 0.1);

            // Bottom Peg (Rounded Tip)
            translate([0, -peg_spacing, -board_thickness])
                sphere(d=peg_diameter);
        }

        // --- Versatile Mounting Interface ---
        // Center M3 Hole & Captured Nut
        translate([0, -peg_spacing/2, -0.1]) {
            cylinder(d=hole_diameter, h=base_thickness + 0.2);
            cylinder(d=nut_width_flats / cos(30), h=nut_depth + 0.1, $fn=6);
        }

        // Top M3 Hole & Captured Nut
        translate([0, -peg_spacing/2 + 8, -0.1]) {
            cylinder(d=hole_diameter, h=base_thickness + 0.2);
            cylinder(d=nut_width_flats / cos(30), h=nut_depth + 0.1, $fn=6);
        }

        // Bottom M3 Hole & Captured Nut
        translate([0, -peg_spacing/2 - 8, -0.1]) {
            cylinder(d=hole_diameter, h=base_thickness + 0.2);
            cylinder(d=nut_width_flats / cos(30), h=nut_depth + 0.1, $fn=6);
        }
    }
}

// Render the part
// Note: For maximum strength, rotate 90 degrees on the X or Y axis in your slicer 
// so the layer lines run along the length of the pegs.
pegboard_mount();