cipher wheel scad

// ceaser cipher wheel
// Parameters
ring_thickness = 9;    // Thickness of the ring (radial)
ring_height = 5;       // Height of the ring
letter_count = 26;
angle_step = 360 / letter_count;
font_size = 6;
font_name = "Liberation Sans";  // Change if needed

module ring_with_letters(ring_radius) {
    difference() {
        // Outer cylinder
        cylinder(h = ring_height, r = ring_radius + ring_thickness / 2, $fn = 200);
        // Inner hole
        cylinder(h = ring_height + 1, r = ring_radius - ring_thickness / 2, $fn = 200);
    }

    // Add letters
    for (i = [0 : letter_count - 1]) {
        angle = i * angle_step;
        letter = chr(65 + i);  // 65 = 'A'

        rotate([0, 0, angle])
        translate([ring_radius, 0, ring_height])
        rotate([0, 0, 0])
        linear_extrude(height = 1)
            text(letter, size = font_size, font = font_name, halign = "center", valign = "bottom");
    }
}

// Example usage:
ring_with_letters(50);
ring_with_letters(40.7);