This is a ring I created

ring.scad

RESOLUTION = 8;
$fn = RESOLUTION;
SECTIONS_FACTOR = 1;
SECTIONS = 256/SECTIONS_FACTOR;
RADIUS = 1;
RING_RADIUS = 18/2;
BAND_WIDTH = 4;
SEGMENT_LENGTH = ((2 * 3.14159 * RING_RADIUS + RADIUS)/SECTIONS+0.0452)*SECTIONS_FACTOR;//0.27;
HOLE_RADIUS = 0.5;
PATTERN_OFFSET=HOLE_RADIUS;
module uncut_ring_segment(){
    cylinder(SEGMENT_LENGTH,RADIUS,RADIUS, center=true);
    translate([0,-1,-SEGMENT_LENGTH/2]) cube([BAND_WIDTH, RADIUS * 2, SEGMENT_LENGTH]);
    translate([BAND_WIDTH,0,0])cylinder(SEGMENT_LENGTH,RADIUS,RADIUS, center=true);
}
module ring_segment(i,pos){
    uncut_ring_segment();
    for(j = [0:1]){
            translate([pos * (BAND_WIDTH-PATTERN_OFFSET*2) + PATTERN_OFFSET,RADIUS,-SEGMENT_LENGTH/2])cylinder(SEGMENT_LENGTH,HOLE_RADIUS,HOLE_RADIUS);
        }
}
positions = [0,1,2,4,6,8,10,8,6,5,6,8,10,8,6,5,4,3,2,1,2,3,5,6,8,10,8,6,5,3,2,1,0];

module ring(){
    randoms = rands(1,10,SECTIONS);
    for(i = [0:SECTIONS]){
        pos = positions[i%(128/4)];
        rotate([0,90,0]) rotate([i * 360/SECTIONS,0,0]) translate([0,RING_RADIUS+RADIUS,0])  ring_segment(i,pos/10.0);//(sin(i*14*2)+1+(randoms[i]/10-5/10))*0.4+0.1);
}
}
rotate([180,0,0])ring();