Mazda EDC Key Fob with AirTag and Key Organizer

Do you hate your large Mazda key fob – and detest the mess of jangling keys and keychains in your pocket – as much as I do? Of course not, because I'm the only weirdo that decided to make this thing. That said, you're still welcome to make one too.

This model is a compact case replacement for the circuit board from the inside of a ~2020+ Mazda key fob. It includes an integral AirTag holder and KeySmart/KeyBar/KeyPort-style key organizer.  This makes for an especially EDC-friendly carry package. No annoying jangles!  It carries easily in a pocket or even a multitool sheath, as it is similar in overall size to a Leatherman FREE P2 and many others.

• The three included button cover styles are arbitrarily interchangeable between each position, but are designed to be easily distinguished by feel in your pocket (lock, unlock, and panic).

Note: you will need to conjure a way for the upper side of the CR2032 battery to make contact with the PCB. I elected to simply solder a short wire to a thin ring terminal as pictured.

• Simply add Chicago Screws (M4, 5mm barrel diameter) of your preferred overall length, depending on how many keys you want to carry.
• The “Key Bar Support Stud” part is meant to slide under the hexagonal key cover in order to keep it from flexing. Glue it to the main key fob body wherever you prefer – or don't… it is held in place by the cover plate itself.

Get creative: along with your keys, you can even consider adding alternate implements to create a key-fob multitool. YubiKey, USB flash drive, etc. For example, a combination that works well, thickness-wise, is to put two keys on the upper corner and a YubiKey 5C down below.

I recommend 0.1 mm layers. Supports are handy for the cover plate and button holes only.

I used this very clever design's excellent-fitting AirTag contour, and heavily adapted it for my own purposes.