$fn = 64;

// --- Parametric Variables ---
// Grid configuration
grid_x = 2;
grid_y = 2;
cell_size = 20;         // Size of each grid cell in mm
base_thickness = 6;     // Main plate thickness

// Top connection pegs (for stacking and figure placement)
peg_diameter = 6;
peg_height = 3;

// Bottom connection holes (for interlocking/stacking)
hole_tolerance = 0.3;
hole_diameter = peg_diameter + hole_tolerance;
hole_depth = peg_height + 0.5;

// Accessory/Stand mounting hole (center)
center_hole_diameter = 4;
center_hole_depth = base_thickness + 1;

module figure_stage_baseplate() {
    // Calculate total dimensions
    width = grid_x * cell_size;
    depth = grid_y * cell_size;
    
    difference() {
        union() {
            // Main baseplate body
            translate([-width/2, -depth/2, 0])
                cube([width, depth, base_thickness]);
            
            // Top interlocking pegs
            for (x = [0 : grid_x - 1]) {
                for (y = [0 : grid_y - 1]) {
                    translate([
                        (x * cell_size) - (width / 2) + (cell_size / 2),
                        (y * cell_size) - (depth / 2) + (cell_size / 2),
                        base_thickness
                    ])
                    // Peg with slight chamfer for easier stacking
                    union() {
                        cylinder(h = peg_height - 0.5, d = peg_diameter);
                        translate([0, 0, peg_height - 0.5])
                            cylinder(h = 0.5, d1 = peg_diameter, d2 = peg_diameter - 1);
                    }
                }
            }
        }
        
        // Bottom interlocking holes
        for (x = [0 : grid_x - 1]) {
            for (y = [0 : grid_y - 1]) {
                translate([
                    (x * cell_size) - (width / 2) + (cell_size / 2),
                    (y * cell_size) - (depth / 2) + (cell_size / 2),
                    -0.01 // Offset to prevent z-fighting
                ])
                // Hole with slight entry chamfer
                union() {
                    cylinder(h = hole_depth, d = hole_diameter);
                    cylinder(h = 0.5, d1 = hole_diameter + 1, d2 = hole_diameter);
                }
            }
        }
        
        // Center accessory/stand mounting hole
        translate([0, 0, -0.01])
            cylinder(h = center_hole_depth, d = center_hole_diameter);
            
        // Optional: Cutout cross on bottom to save material and aid printability
        translate([-width/2 + 2, -1, -0.01])
            cube([width - 4, 2, 2]);
        translate([-1, -depth/2 + 2, -0.01])
            cube([2, depth - 4, 2]);
    }
}

// Generate the model
figure_stage_baseplate();