$fn = 64;

// --- Parameters ---
pen_hole_diameter = 14;      // Inner diameter of the cup
wall_thickness = 2.5;        // Thickness of the cup walls
cup_height = 50;             // Total height of the pen cup

// Hexagon plug settings (default fits Honeycomb Storage Wall)
hex_flat_to_flat = 19.8;     // Flat-to-flat distance (slightly undersized for fit)
hex_depth = 8;               // Depth of the hex plug into the wall
standoff_length = 4;         // Distance between wall and cup

// --- Derived Variables ---
cup_outer_dia = pen_hole_diameter + (wall_thickness * 2);
hex_radius = hex_flat_to_flat / sqrt(3);
attachment_z = cup_height - 15;

// --- Main Assembly ---
difference() {
    union() {
        // Cup Exterior
        translate([0, standoff_length + cup_outer_dia/2, 0])
            cylinder(d=cup_outer_dia, h=cup_height);

        // Hex Plug (pointing into the wall, -Y direction)
        translate([0, 0, attachment_z])
            rotate([90, 0, 0])
            rotate([0, 0, 30])
            union() {
                // Main hex body
                cylinder(r=hex_radius, h=hex_depth - 1, $fn=6);
                // Chamfer for easy insertion
                translate([0, 0, hex_depth - 1])
                    cylinder(r1=hex_radius, r2=hex_radius - 1, h=1, $fn=6);
            }

        // Standoff / Connector
        hull() {
            // Hex base at wall (Y=0)
            translate([0, 0, attachment_z])
                rotate([90, 0, 0])
                rotate([0, 0, 30])
                cylinder(r=hex_radius, h=0.1, $fn=6);

            // Cup attachment body
            translate([0, standoff_length + cup_outer_dia/2, attachment_z])
                cylinder(d=cup_outer_dia, h=hex_flat_to_flat, center=true);
        }
    }

    // Cup Interior (Hole)
    // Carved out after union to ensure a perfectly clean interior
    translate([0, standoff_length + cup_outer_dia/2, wall_thickness])
        cylinder(d=pen_hole_diameter, h=cup_height + 1);
}