$fn = 64;

// --- Parameters ---
holder_width = 140;        // Total width of the holder
holder_depth = 80;         // Total depth of the holder
holder_height = 90;        // Maximum height (at the back)
wall_thickness = 3;        // Thickness of the outer walls and dividers
comb_slot_depth = 18;      // Depth of the rear slot for combs
corner_radius = 6;         // Radius of the outer corners
top_angle = 12;            // Angle of the top slant

// --- Calculated Variables ---
brush_slot_width = (holder_width - (wall_thickness * 3)) / 2;
brush_slot_depth = holder_depth - (wall_thickness * 3) - comb_slot_depth;

// --- Modules ---
// Creates a rectangular block with rounded vertical corners
module rounded_rect(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([r, d-r, 0]) cylinder(r=r, h=h);
        translate([w-r, d-r, 0]) cylinder(r=r, h=h);
    }
}

// --- Main Geometry ---
difference() {
    // 1. Main Solid Body
    rounded_rect(holder_width, holder_depth, holder_height, corner_radius);

    // 2. Rear Comb Slot Cutout
    translate([wall_thickness, holder_depth - wall_thickness - comb_slot_depth, wall_thickness])
        rounded_rect(
            holder_width - (wall_thickness * 2), 
            comb_slot_depth, 
            holder_height + 10, 
            corner_radius / 2
        );

    // 3. Left Brush Slot Cutout
    translate([wall_thickness, wall_thickness, wall_thickness])
        rounded_rect(
            brush_slot_width, 
            brush_slot_depth, 
            holder_height + 10, 
            corner_radius / 2
        );

    // 4. Right Brush Slot Cutout
    translate([wall_thickness * 2 + brush_slot_width, wall_thickness, wall_thickness])
        rounded_rect(
            brush_slot_width, 
            brush_slot_depth, 
            holder_height + 10, 
            corner_radius / 2
        );

    // 5. Angled Top Cut
    translate([-10, holder_depth, holder_height])
        rotate([-top_angle, 0, 0])
        translate([0, -(holder_depth + 20), 0])
        cube([holder_width + 20, holder_depth + 40, holder_height]);

    // 6. Drainage Holes (Brush Slots)
    translate([wall_thickness + brush_slot_width / 2, wall_thickness + brush_slot_depth / 2, -1])
        cylinder(d=15, h=wall_thickness + 2);
        
    translate([wall_thickness * 2 + brush_slot_width * 1.5, wall_thickness + brush_slot_depth / 2, -1])
        cylinder(d=15, h=wall_thickness + 2);

    // 7. Drainage Holes (Comb Slot)
    for(i = [1 : 3]) {
        translate([holder_width * (i / 4), holder_depth - wall_thickness - comb_slot_depth / 2, -1])
            cylinder(d=10, h=wall_thickness + 2);
    }
}