$fn = 64;

// --- PARAMETERS ---
rack_width = 160;       // Total width of the rack
rack_depth = 60;        // Total depth (front to back)
rack_height = 140;      // Total height
wall_thickness = 6;     // Thickness of walls and base

// Slot dimensions for holding brush handles
slot_width = 12;        // Width of the U-slots
slot_depth = 35;        // Depth of the U-slots
num_slots = 6;          // Number of brushes the rack can hold

// Note: Recommended print orientation is laying flat on the back wall to avoid supports.

union() {
    // Base Plate (Catches drips and provides stability)
    cube([rack_width, rack_depth, wall_thickness]);

    // Back Wall (Solid for rigidity and easy flat-printing)
    translate([0, rack_depth - wall_thickness, 0])
        cube([rack_width, wall_thickness, rack_height]);

    // Left Side Panel
    cube([wall_thickness, rack_depth, rack_height]);

    // Right Side Panel
    translate([rack_width - wall_thickness, 0, 0])
        cube([wall_thickness, rack_depth, rack_height]);

    // Top Slotted Holder
    translate([0, 0, rack_height - wall_thickness])
    difference() {
        cube([rack_width, rack_depth, wall_thickness]);
        
        // Cut U-shaped slots for brushes
        slot_spacing = (rack_width - 2 * wall_thickness) / num_slots;
        for (i = [0 : num_slots - 1]) {
            slot_center_x = wall_thickness + (slot_spacing / 2) + (i * slot_spacing);
            
            translate([slot_center_x - slot_width / 2, -1, -1]) {
                // Straight entry path
                cube([slot_width, slot_depth + 1, wall_thickness + 2]);
                // Rounded resting point
                translate([slot_width / 2, slot_depth + 1, 0])
                    cylinder(h = wall_thickness + 2, d = slot_width);
            }
        }
    }
}