$fn=64;

// --- Parameters ---
hex_radius = 45;         // Outer radius of the hexagon base
base_thickness = 5;      // Thickness of the base plate
pen_diameter = 12.5;     // Diameter of the pen holes (includes clearance)
holder_height = 40;      // Total height of the pen holders
wall_thickness = 3;      // Thickness of the walls around the pens
hole_offset = 18;        // Distance of each pen hole from the center

holder_outer_radius = (pen_diameter / 2) + wall_thickness;

difference() {
    // Main solid body
    union() {
        // Hexagonal base tile
        cylinder(r=hex_radius, h=base_thickness, $fn=6);
        
        // Pen holder outer cylinders
        for(i = [0 : 120 : 359]) {
            rotate([0, 0, i])
            translate([hole_offset, 0, 0])
            cylinder(r=holder_outer_radius, h=holder_height);
        }
        
        // Central reinforcement joining the holders for strength
        cylinder(r=hole_offset, h=holder_height * 0.6);
    }
    
    // Subtract pen holes (leaving base_thickness at the bottom)
    for(i = [0 : 120 : 359]) {
        rotate([0, 0, i])
        translate([hole_offset, 0, base_thickness])
        cylinder(r=pen_diameter/2, h=holder_height - base_thickness + 1);
    }
}