$fn = 120;
thickness = 8;
height = 12;
width = 2;

module zero() {
    difference() {
        translate([0, 0, -.5*thickness])
            cylinder(h=thickness, d=height);
        translate([0, 0, -.5*thickness-1])
            cylinder(h=thickness+2, d=height - 2*width);
    }
}

module zerohole() {
    translate([0, 0, -.5*thickness - 3])
        cylinder(h=thickness+6, d=height - .5);
}

module one() {
    translate([-.5*width, -.5*height, -.5*thickness])
        cube([width, height, thickness]);
    translate([-1.5*width, .5*height - width, -.5*thickness])
        cube([2*width, width, thickness]);
}

module widget() {
    translate([-.5*height - 2, 0, 0]) zero();
    one();
    translate([.5*height + 2, 0, 0]) zero();
    difference() {
        intersection() {
            translate([-10, 0, -.5*width])
                cube([20, 13, width]);
            translate([0, 17, -20])
                rotate(225, [0, 0, 1])
                    cube([50, 50, 50]);
        }
        translate([-.5*height - 2, 0, 0]) zerohole();
        translate([.5*height + 2, 0, 0]) zerohole();
        translate([0, 9, -10]) cylinder(d=4, h=20);
    }
}

step = 30;
for (x = [-100:step:101]) {
    for (y = [-100:step:101]) {
        translate([x, y, 0]) widget();
    }
}