$fn=64;

// --- Parameters ---
hex_radius = 20;         // Radius of a single hexagon (center to point)
base_thickness = 2;      // Thickness of the solid bottom layer
raised_thickness = 1.5;  // Thickness of the raised hex tiles
grid_gap = 1.2;          // Width of the gap between raised hexes
rings = 3;               // 3 rings around center = 37 hexes total

// --- Modules ---
module hex_prism(r, h) {
    // $fn=6 creates a perfect hexagon when using cylinder
    cylinder(r=r, h=h, $fn=6);
}

module 37_hex_baseplate() {
    union() {
        // Continuous solid base layer
        for (q = [-rings : rings]) {
            for (r = [-rings : rings]) {
                // Axial coordinate distance formula for hex grid
                if (abs(q) + abs(r) + abs(q+r) <= rings * 2) {
                    x_pos = sqrt(3) * hex_radius * (q + r/2);
                    y_pos = 1.5 * hex_radius * r;
                    
                    translate([x_pos, y_pos, 0])
                        // Add 0.1 overlap to ensure a perfectly manifold watertight base
                        hex_prism(r=hex_radius + 0.1, h=base_thickness);
                }
            }
        }
        
        // Raised individual hex tiles
        for (q = [-rings : rings]) {
            for (r = [-rings : rings]) {
                if (abs(q) + abs(r) + abs(q+r) <= rings * 2) {
                    x_pos = sqrt(3) * hex_radius * (q + r/2);
                    y_pos = 1.5 * hex_radius * r;
                    
                    // Overlap Z by 0.01 to ensure manifold union with base
                    translate([x_pos, y_pos, base_thickness - 0.01])
                        hex_prism(r=hex_radius - grid_gap, h=raised_thickness + 0.01);
                }
            }
        }
    }
}

// --- Render ---
37_hex_baseplate();