$fn = 64;

// --- Parameters ---
pot_inner_dia = 105;     // Fits standard 4-inch pot (with clearance)
wall_thickness = 5;      // Robust wall for vertical stacking
ring_height = 50;        // Height of the main pot ring body
stack_depth = 12;        // Depth of the interlocking joint
clearance = 0.6;         // Tolerance for easy stacking
saucer_extension = 16;   // Width of the built-in saucer lip
saucer_height = 24;      // Height of the saucer outer wall
drain_hole_dia = 8;      // Diameter of drainage holes
floor_dome = 2;          // Center height offset to direct water to edges

// --- Derived Variables ---
r_in = pot_inner_dia / 2;
r_out = r_in + wall_thickness;
r_stack_mid = r_in + wall_thickness / 2;

module stackable_pot_ring() {
    difference() {
        // Main solid body via revolved 2D profile
        rotate_extrude() {
            polygon([
                [0, stack_depth], 
                [r_stack_mid + clearance/2, stack_depth], // Inner socket top
                [r_stack_mid + clearance/2, 0],           // Socket bottom opening
                [r_out + saucer_extension, 0],            // Saucer outer base
                [r_out + saucer_extension, saucer_height], // Saucer lip top
                [r_out + saucer_extension - wall_thickness, saucer_height], // Saucer lip inner
                [r_out + saucer_extension - wall_thickness, wall_thickness], // Saucer floor
                [r_out, wall_thickness],                  // Main outer wall base
                [r_out, ring_height],                     // Top outer shoulder
                [r_stack_mid - clearance/2, ring_height], // Base of male plug
                [r_stack_mid - clearance/2, ring_height + stack_depth - 1], // Plug top chamfer start
                [r_stack_mid - clearance/2 - 1, ring_height + stack_depth], // Plug top chamfer end
                [r_in, ring_height + stack_depth],        // Inner top edge
                [r_in, stack_depth + wall_thickness],     // Inner floor perimeter
                [0, stack_depth + wall_thickness + floor_dome] // Inner floor center (domed)
            ]);
        }
        
        // Central vertical drainage hole
        translate([0, 0, stack_depth - 5])
            cylinder(h = wall_thickness + floor_dome + 10, r = drain_hole_dia);
            
        // Perimeter vertical drainage holes
        for(i = [0 : 60 : 359]) {
            rotate([0, 0, i])
            translate([r_in * 0.5, 0, stack_depth - 5])
            cylinder(h = wall_thickness + floor_dome + 10, r = drain_hole_dia / 2);
        }
        
        // Radial drainage slots (connects inner floor to the saucer lip)
        for(i = [0 : 45 : 359]) {
            rotate([0, 0, i])
            translate([r_out, 0, stack_depth + wall_thickness])
            rotate([0, 90, 0])
            cylinder(h = 40, r = drain_hole_dia / 2, center = true);
        }
    }
}

// Render the object
stackable_pot_ring();