The version 3 requires using a wire or something else to the retainers to pull them through the channel.

This 3D model is a must-have for anyone who wears glasses and is tired of constantly misplacing them. With a convenient and innovative design, this eyewear retainer accessory allows you to attach an AirTag to your glasses, ensuring that you'll always know where they are. Simply thread a regular eyewear retainer through the holes to use this accessory. Whether you're running errands or just at home, this accessory will make your life so much easier. Plus, with three different styles to choose from, you can pick the one that best suits your personal style. Just be sure to pay attention to the press fit for the AirTag mount, as you may need to adjust the scale slightly depending on your printer.