$fn = 64;

// --- PARAMETERS ---

// Sticky Note Pad Dimensions (Standard 3x3 inch pad is ~76.2mm)
pad_width = 78;       // Clearance included
pad_height = 78;      // Clearance included
pad_thickness = 12;   // Holds a standard ~10mm stack

// Holder Settings
wall_thickness = 2;
front_cutout_radius = 30;

// HSW (Honeycomb Storage Wall) Peg Settings
hex_flat_to_flat = 19.6; // 20mm standard, slightly undersized for clearance
hex_radius = hex_flat_to_flat / sqrt(3);
hex_depth = 8;
hex_pitch = 40.88;       // Standard HSW horizontal hole spacing

// Calculated Outer Dimensions
outer_w = pad_width + (wall_thickness * 2);
outer_h = pad_height + (wall_thickness * 2);
outer_d = pad_thickness + (wall_thickness * 2);

// --- MODEL ---

union() {
    // Main Holder Body
    translate([0, 0, outer_d / 2])
    difference() {
        // Outer shell
        cube([outer_w, outer_h, outer_d], center=true);

        // Inner pocket
        // Shifted in Y to leave a solid bottom wall and cut completely through the top
        translate([0, wall_thickness, 0])
            cube([pad_width, outer_h, pad_thickness], center=true);

        // Front thumb cutout for easy grabbing
        // Starts at Z=0 (middle of pad) and cuts through the front wall (+Z)
        translate([0, outer_h / 2, 0])
            cylinder(r=front_cutout_radius, h=outer_d);
    }

    // Left HSW Peg
    // Translated slightly into the back wall (+0.1 Z) to ensure a manifold union
    translate([-hex_pitch / 2, 0, 0.1])
        rotate([0, 180, 0])
        cylinder(r=hex_radius, h=hex_depth + 0.1, $fn=6);

    // Right HSW Peg
    translate([hex_pitch / 2, 0, 0.1])
        rotate([0, 180, 0])
        cylinder(r=hex_radius, h=hex_depth + 0.1, $fn=6);
}