$fn=64;

// --- Parameters ---
rack_width = 180;
rack_depth = 60;
rack_height = 45;
wall_thickness = 4;
base_thickness = 4;
corner_radius = 3;

tray_width = 40;
tray_depth = 15;
comb_slot_width = 8;
brush_hole_dia = 32;

// --- Derived Variables ---
inner_h = rack_height - base_thickness + 1;

// --- Modules ---
module rounded_cube(w, d, h, r) {
    hull() {
        translate([r, r, 0]) cylinder(r=r, h=h);
        translate([w-r, r, 0]) cylinder(r=r, h=h);
        translate([w-r, d-r, 0]) cylinder(r=r, h=h);
        translate([r, d-r, 0]) cylinder(r=r, h=h);
    }
}

// --- Main Geometry ---
difference() {
    // Main Body
    rounded_cube(rack_width, rack_depth, rack_height, corner_radius);

    // 1. Accessory Tray (Left)
    translate([wall_thickness, wall_thickness, rack_height - tray_depth])
        cube([tray_width, rack_depth - 2*wall_thickness, tray_depth + 1]);

    // 2. Comb Slot 1
    translate([wall_thickness*2 + tray_width, wall_thickness, base_thickness])
        cube([comb_slot_width, rack_depth - 2*wall_thickness, inner_h]);

    // 3. Comb Slot 2
    translate([wall_thickness*3 + tray_width + comb_slot_width, wall_thickness, base_thickness])
        cube([comb_slot_width, rack_depth - 2*wall_thickness, inner_h]);

    // 4. Brush Hole 1
    translate([wall_thickness*4 + tray_width + comb_slot_width*2 + brush_hole_dia/2, rack_depth/2, base_thickness])
        cylinder(d=brush_hole_dia, h=inner_h);

    // 5. Brush Hole 2
    translate([wall_thickness*5 + tray_width + comb_slot_width*2 + brush_hole_dia*1.5, rack_depth/2, base_thickness])
        cylinder(d=brush_hole_dia, h=inner_h);

    // 6. Brush Hole 3
    translate([wall_thickness*6 + tray_width + comb_slot_width*2 + brush_hole_dia*2.5, rack_depth/2, base_thickness])
        cylinder(d=brush_hole_dia, h=inner_h);
}