// ==========================================
// PARAMETERS
// ==========================================
// Define variables here for easy global modification
length = 45;       
width = 35;        
height = 20;       
wall_thickness = 2.5; 
gap = 0.25;        // Clearance tolerance for 3D printing fitment

// ==========================================
// EXECUTION
// ==========================================
// Display the assembly side-by-side
base_housing();

translate([length + 15, 0, 0]) 
    snap_fit_lid();

// ==========================================
// MODULES
// ==========================================

// --- Module: base_housing ---
// Logic: Solid box MINUS Inner box MINUS Side slot
module base_housing() {
    difference() {
        // Main outer body
        cube([length, width, height]);
        
        // Internal hollow space (translated to leave wall thickness)
        translate([wall_thickness, wall_thickness, wall_thickness])
            cube([length - 2*wall_thickness, width - 2*wall_thickness, height]);
            
        // Wire outlet: A small cutout on the side for cables
        translate([-1, width/2 - 4, height - 8])
            cube([wall_thickness + 2, 8, 10]);
    }
}

// --- Module: snap_fit_lid ---
// Logic: Flat plate PLUS Inner rim (slightly smaller for gap)
module snap_fit_lid() {
    // The top cover plate
    cube([length, width, wall_thickness]);
    
    // Internal rim dimensions calculated based on walls and gap
    inner_l = length - 2*wall_thickness - gap;
    inner_w = width - 2*wall_thickness - gap;
    
    // The locking rim that secures the lid to the base
    translate([wall_thickness + gap/2, wall_thickness + gap/2, wall_thickness])
        difference() {
            // The solid rim block
            cube([inner_l, inner_w, 4]); 
            
            // Hollowing the rim to save material
            translate([1.5, 1.5, -1])
                cube([inner_l - 3, inner_w - 3, 6]);
        }
}