$fn=64;

// --- Parameters ---
rows = 5;           // Number of rows
cols = 5;           // Number of columns
cell_w = 12.0;      // Width of each cell (mm)
cell_l = 12.0;      // Length of each cell (mm)
cell_d = 8.0;       // Depth of the cells (mm)
wall_t = 1.2;       // Wall thickness between cells (mm)
floor_t = 1.2;      // Floor thickness (mm)

// --- Calculated Dimensions ---
total_w = (cols * cell_w) + ((cols + 1) * wall_t);
total_l = (rows * cell_l) + ((rows + 1) * wall_t);
total_h = cell_d + floor_t;

// --- Module Generation ---
difference() {
    // Main outer body
    cube([total_w, total_l, total_h]);
    
    // Subtract the grid of cells
    for (r = [0 : rows - 1]) {
        for (c = [0 : cols - 1]) {
            // Calculate X and Y positions for each cell
            x_pos = wall_t + c * (cell_w + wall_t);
            y_pos = wall_t + r * (cell_l + wall_t);
            
            // Subtract cell volume
            // Added 1.0mm to Z height to ensure a clean manifold cut through the top
            translate([x_pos, y_pos, floor_t])
                cube([cell_w, cell_l, cell_d + 1.0]);
        }
    }
}