To keep my access card—something I often forget to bring—with me, I’ve tried various approaches.

Here’s the latest idea: I’ve placed it inside my iWatch band.

I designed it to be as invisible as possible, without altering the original look of the strap and ensuring it doesn’t come into direct contact with the skin.

If you think this is a good idea too, give it a try. It comes in two sizes: one fits 24mm-wide bands, while the other suits 22mm bands.

Because the components are very small and thin, by default, slicing software doesn’t generate support structures. I modified this setting.

Oh, right—the access card needs to be a soft sticker-type IC CUID. Whether it works depends largely on your original card’s format. Most cards are compatible; this type is relatively the most popular. As for reading/writing the card, I handled that myself—typically, card vendors also offer such services.