$fn=64;

// --- Parametric Dimensions ---
cols = 5;               // Number of bottles across
rows = 3;               // Number of tiers
bottle_d = 25.5;        // Diameter of Vallejo dropper bottle (24.5mm + 1mm clearance)
pitch_x = 30;           // Spacing between holes (X)
pitch_y = 32;           // Spacing between tiers (Y)
tier_h = 25;            // Height difference between tiers
hole_depth = 18;        // Depth of the bottle holes
base_thick = 2;         // Thickness of the floor under the bottles
slot_width = 12;        // Width of the front viewing slot

// --- Calculated Dimensions ---
width = cols * pitch_x;
depth = rows * pitch_y;

module vallejo_rack() {
    difference() {
        // Main Solid Body
        union() {
            // Tiered steps
            for(r = [0 : rows - 1]) {
                translate([0, r * pitch_y, 0])
                    cube([width, pitch_y, base_thick + hole_depth + (r * tier_h)]);
            }

            // Universal Mounting Cleat (ArtArsenal / French Cleat style)
            // Positioned at the top rear of the rack
            back_h = base_thick + hole_depth + ((rows - 1) * tier_h);
            translate([0, depth, back_h - 25])
                rotate([90, 0, 90])
                linear_extrude(width)
                polygon([
                    [0, 0],
                    [0, 25],
                    [6, 25],   // Stick out 6mm
                    [6, 10],   // Drop down straight
                    [2, 6],    // 45-degree angle back in for easy printing
                    [2, 0]     // Drop to base of cleat
                ]);
        }

        // Bottle Holes and Viewing Slots
        for(r = [0 : rows - 1]) {
            for(c = [0 : cols - 1]) {
                
                x_pos = (pitch_x / 2) + (c * pitch_x);
                y_pos = (pitch_y / 2) + (r * pitch_y);
                z_pos = base_thick + (r * tier_h);

                // Main bottle hole
                translate([x_pos, y_pos, z_pos])
                    cylinder(h = hole_depth + 5, d = bottle_d);

                // Front viewing slot for paint color visibility
                translate([x_pos - (slot_width / 2), (r * pitch_y) - 1, z_pos])
                    cube([slot_width, (pitch_y / 2) + 2, hole_depth + 5]);
            }
        }
    }
}

// Render the model
vallejo_rack();