overall_outer_diameter = 75;

overall_thickness = 15;

neopixel_holder_thickness = 7.5;

translucent_disk_thickness = overall_thickness - neopixel_holder_thickness;

ring_z_offset = neopixel_holder_thickness - ring_thickness;

channel_length = ring_24_inner_diameter/2;

channel_width = 4;

channel_angle = 32.5;

alignment_pin_position = (-overall_outer_diameter/2) + 1.5; 

alignment_pin_width = 4;

alignment_pin_length = ((overall_outer_diameter/2 - ring_24_outer_diameter/2)/2) + 1.5;

$fn = 200;

module ring(h, od, id) {

    difference() {

        cylinder(h=h, d=od);

        cylinder(h=h, d=id);

    }

};

module channel() {    

    translate([-(channel_length), -(channel_width/2), ring_z_offset])

        cube([channel_length, channel_width, ring_thickness+1]);

    for (angle=[channel_angle, -channel_angle])

        rotate([0, 0, angle])

            translate([0, -(channel_width/2), ring_z_offset])

                cube([channel_length, channel_width, ring_thickness+1]);

    translate([0, 0, -1])

        cylinder(h=neopixel_holder_thickness+2, d=main_channel_diameter);

};

module alignment_pin() {

    for (x=[0, 1])

      mirror([x, 0, 0])

        translate([alignment_pin_position, -(alignment_pin_width-0.2)/2, ring_z_offset])

          cube([alignment_pin_length, alignment_pin_width-0.2, neopixel_holder_thickness - ring_z_offset + 0.1]);

}

module neopixel_holder() {

    difference () {

        cylinder(h=neopixel_holder_thickness, d=overall_outer_diameter);

            translate([0, 0, ring_z_offset])

                ring(h=ring_thickness+1, od=d[0], id=d[1]);

        channel();

        alignment_pin();

    }

};

module translucent_disk() {

    cylinder(h=translucent_disk_thickness, d=overall_outer_diameter);

    for (x=[0, 1])

        mirror([x, 0, 0])

            translate([alignment_pin_position, -(4-0.2)/2, translucent_disk_thickness])

                cube([3, 4-0.2, neopixel_holder_thickness -ring_z_offset]);

};

neopixel_holder();

// translate([-(overall_outer_diameter/2+1), 0, 0]) neopixel_holder();

//translate([(overall_outer_diameter/2+1), 0, 0]) translucent_disk();