$fn = 64;

// --- Parameters ---
hex_radius = 20;         // Circumradius of a single base hexagon
height_units = 3;        // Bin height in units
unit_height = 10;        // Height of a single unit in mm
wall_thickness = 1.6;    // Thickness of the outer walls
floor_thickness = 1.6;   // Thickness of the bottom floor

// --- Calculated Variables ---
total_height = height_units * unit_height;
// Distance between centers in a standard pointy-top hex grid
dx = sqrt(3) * hex_radius; 
dy = 1.5 * hex_radius;

// Single hexagon profile (pointy top)
module hex_profile() {
    rotate([0, 0, 30]) circle(r=hex_radius, $fn=6);
}

// Outer triangular shape spanning 3 hexes, centered at origin
module bin_profile() {
    translate([-dx/2, -dy/3]) {
        hull() {
            translate([0, 0]) hex_profile();
            translate([dx, 0]) hex_profile();
            translate([dx/2, dy]) hex_profile();
        }
    }
}

// Main Bin Geometry
difference() {
    // Outer shell
    linear_extrude(total_height) {
        bin_profile();
    }
    
    // Inner cavity (hollowed out)
    // offset(r=-wall_thickness) cleanly shrinks the profile and rounds the interior corners
    translate([0, 0, floor_thickness]) {
        linear_extrude(total_height + 1) { // +1 prevents z-fighting on rendering
            offset(r=-wall_thickness) bin_profile();
        }
    }
}