Summary

This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/8MFoWURo1qI

This is a mod from https://www.thingiverse.com/thing:3550573
If you can get the chip out of your credit card, then you can try fitting into your watch bracelet instead of a ring.

There is an example of what I did in my case with a miband2 bracelet.
I coiled the 50cm wire around the small "sandwich". Then I painted everything black.
It works!

Printed on a Prusa Mini

Print Settings

Printer Brand:

Prusa

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>i3 MK3</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>.2</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>15%</p></div></p>                                                    <strong>Filament:</strong> BenQ PLA                White

NFC Watch add on (miband)