// Here is a parametric OpenSCAD script that generates both the base case and the matching top lid. 
// You can adjust the dimensions (inside_length, inside_width, inside_height) at the top of the file 
// to perfectly fit your specific container or cell setup.
// To render the lid, simply change the render_lid variable from false to true.

// ==========================================
// Parametric Case and Top Lid
// ==========================================

// Internal dimensions to fit your setup (in mm)
inside_length = 120;
inside_width  = 100;
inside_height = 60;

// Manufacturing parameters
wall_thickness = 3.0;
lip_height     = 4.0;
tolerance      = 0.25; // Gap between lid lip and case wall for 3D printing fit

// Toggle between rendering the base case or the lid
render_lid = false; 

// Resolution control for rounded corners (if added later)
$fn = 60;

if (render_lid) {
    lid();
} else {
    base_case();
}

// --- Modules ---

module base_case() {
    difference() {
        // Outer box
        cube([
            inside_length + (2 * wall_thickness), 
            inside_width + (2 * wall_thickness), 
            inside_height + wall_thickness
        ]);
        
        // Inner cavity hollow
        translate([wall_thickness, wall_thickness, wall_thickness]) {
            cube([inside_length, inside_width, inside_height + 1]);
        }
    }
}

module lid() {
    // Main flat top piece
    cube([
        inside_length + (2 * wall_thickness), 
        inside_width + (2 * wall_thickness), 
        wall_thickness
    ]);
    
    // Inner alignment rim that goes inside the case
    translate([
        wall_thickness + tolerance, 
        wall_thickness + tolerance, 
        wall_thickness
    ])
    difference() {
        // Outer boundary of the insert lip
        cube([
            inside_length - (2 * tolerance), 
            inside_width - (2 * tolerance), 
            lip_height
        ]);
        
        // Hollow out the insert lip to save material
        translate([wall_thickness, wall_thickness, -0.5]) {
            cube([
                inside_length - (2 * tolerance) - (2 * wall_thickness), 
                inside_width - (2 * tolerance) - (2 * wall_thickness), 
                lip_height + 1
            ]);
        }
    }
}