I have started to use NFC tags to make my Android phone change profiles depending on the situation I am in (at home, work, in the car, on the bike etc). I can change ring tones, switch wfif/bluetooth on/off or activate apps among other things.While the stickers are great I didn't really want to stick one to my motorbike or car. So I made this simple little keyfob 'adaptor' so that I can attach them to the keys of said transport.Print out (I used 0.3mm layers) and stick on the NFC tag.On one of mine I had infill to 50% with no solid layers to give a nice look to the fob.