$fn=64;

// --- Parameters ---
num_hexagons = 6;        // Number of hexagons in the strip
hex_outer_radius = 16;   // Outer radius (center to point) in mm
strip_height = 12;       // Total height of the strip in mm
wall_thickness = 2;      // Uniform wall thickness in mm
base_thickness = 1.5;    // Solid base thickness in mm (set to 0 for open bottom)

// --- Calculated Variables ---
cos30 = sqrt(3) / 2;
// Calculate inner radius to maintain the exact wall thickness
inner_radius = hex_outer_radius - (wall_thickness / cos30);
// Calculate center-to-center offset to ensure shared walls equal wall_thickness
x_offset = 2 * hex_outer_radius * cos30 - wall_thickness;

// --- Geometry ---
module hex_strip() {
    difference() {
        // Main solid body
        union() {
            for(i = [0 : num_hexagons - 1]) {
                translate([i * x_offset, 0, 0])
                    rotate([0, 0, 30])
                    cylinder(h=strip_height, r=hex_outer_radius, $fn=6);
            }
        }
        
        // Hollow inner cutouts
        union() {
            for(i = [0 : num_hexagons - 1]) {
                // Position cutout above the base, extending past the top for a clean cut
                translate([i * x_offset, 0, base_thickness > 0 ? base_thickness : -1])
                    rotate([0, 0, 30])
                    cylinder(h=strip_height + 2, r=inner_radius, $fn=6);
            }
        }
    }
}

// Render the object
hex_strip();