$fn = 64;

// --- Parameters ---
unit_height = 20;       // Height of a single unit (mm)
height_units = 2;       // Number of height units for the bin
inner_r = 20;           // Inner radius of each hex compartment (center to corner)
wall = 2;               // Wall thickness between compartments
floor_thickness = 2;    // Thickness of the bottom floor

// --- Calculated Variables ---
height = unit_height * height_units;
apothem = inner_r * cos(30);
D = 2 * apothem + wall;             // Distance between adjacent hex centers
outer_r = inner_r + wall / cos(30); // Outer radius to maintain uniform wall thickness

// Module to duplicate geometry across the 19 hex grid positions
module hex_positions() {
    // 1. Center (1 hex)
    translate([0, 0, 0]) 
        children();

    // 2. Inner Ring (6 hexes)
    for (i = [0 : 5]) {
        translate([D * cos(i * 60 + 30), D * sin(i * 60 + 30), 0]) 
            children();
    }

    // 3. Outer Ring Corners (6 hexes)
    for (i = [0 : 5]) {
        translate([2 * D * cos(i * 60 + 30), 2 * D * sin(i * 60 + 30), 0]) 
            children();
    }

    // 4. Outer Ring Edges (6 hexes)
    for (i = [0 : 5]) {
        translate([
            D * cos(i * 60 + 30) + D * cos((i + 1) * 60 + 30),
            D * sin(i * 60 + 30) + D * sin((i + 1) * 60 + 30),
            0
        ]) 
            children();
    }
}

// --- Main Geometry ---
difference() {
    // Solid outer body (union of overlapping outer hexes forms a ribbed shell)
    hex_positions()
        cylinder(r=outer_r, h=height, $fn=6);

    // Hollow inner compartments (subtracted to create the bin)
    translate([0, 0, floor_thickness])
        hex_positions()
            cylinder(r=inner_r, h=height + 1, $fn=6);
}