$fn=64;

// --- Parameters ---
can_diameter = 66.5;      // Standard spray can diameter (with slight clearance)
wall_thickness = 2.5;     // Thickness of the holder walls
num_cans = 3;             // Number of cans the rack will hold
tube_length = 90;         // Length of the holding tubes
tilt_angle = 35;          // Upward tilt angle of the cans (degrees)
backplate_thickness = 5;  // Thickness of the main backplate
spacing = 2;              // Spacing between can holders

// ArtArsenal / Wall Rail Mount Settings
rail_depth = 8;           // Depth of the wall rail cleat
rail_height = 15;         // Height of the wall rail cleat

// --- Calculated Values ---
tube_od = can_diameter + (wall_thickness * 2);
total_width = (tube_od * num_cans) + (spacing * (num_cans + 1));
backplate_height = 120;
z_center = 30;            // Base height where tubes attach to the backplate

module spray_rack() {
    difference() {
        union() {
            // Main backplate
            cube([total_width, backplate_thickness, backplate_height]);

            // Top mounting cleat (ArtArsenal / French Cleat style downward hook)
            translate([0, -rail_depth, backplate_height - rail_height])
            hull() {
                // Top front (against backplate)
                translate([0, rail_depth - 0.1, rail_height - 0.1]) cube([total_width, 0.1, 0.1]);
                // Top back
                translate([0, 0, rail_height - 0.1]) cube([total_width, 0.1, 0.1]);
                // Bottom back (the downward point of the hook)
                translate([0, 0, 0]) cube([total_width, 0.1, 0.1]);
                // Inner corner (creates the 45-degree upward angle to the backplate)
                translate([0, rail_depth - 0.1, rail_depth]) cube([total_width, 0.1, 0.1]);
            }

            // Bottom standoff spacer to keep the rack vertically aligned
            translate([0, -rail_depth, 0])
            cube([total_width, rail_depth, 10]);

            // Can holder tubes and their base transitions
            for(i=[0:num_cans-1]) {
                x_pos = spacing + tube_od/2 + i*(tube_od+spacing);
                
                // Main outer tube
                translate([x_pos, backplate_thickness, z_center])
                rotate([-tilt_angle, 0, 0])
                cylinder(h=tube_length, d=tube_od);

                // Solid base transition connecting the tube to the backplate
                hull() {
                    translate([x_pos, backplate_thickness, z_center])
                    rotate([-tilt_angle, 0, 0])
                    cylinder(h=15, d=tube_od);

                    translate([x_pos - tube_od/2, 0, z_center - tube_od/2])
                    cube([tube_od, backplate_thickness, tube_od]);
                }
            }
        }

        // --- Cutouts ---
        for(i=[0:num_cans-1]) {
            x_pos = spacing + tube_od/2 + i*(tube_od+spacing);

            // Inner cylindrical hole for the can
            translate([x_pos, backplate_thickness, z_center])
            rotate([-tilt_angle, 0, 0])
            translate([0, 0, wall_thickness])
            cylinder(h=tube_length + 10, d=can_diameter);

            // Front visibility slot (shows spray can colors/labels)
            slot_width = can_diameter * 0.75;
            translate([x_pos, backplate_thickness, z_center])
            rotate([-tilt_angle, 0, 0])
            translate([-slot_width/2, can_diameter/4, 25]) // Leaves a 25mm deep cup at the bottom
            cube([slot_width, tube_od, tube_length]);
        }

        // Clean up any geometry that protrudes below the flat bottom (Z < 0)
        translate([-10, -50, -50])
        cube([total_width + 20, 200, 50]);
    }
}

// Render the final part
spray_rack();