HID key fob card holder

Found that I use different sets of keys depending on my form of transport, so hanging the keyfob to a key ring means I'm sometimes stuck. But I always carry my wallet, and want to put the fob into the wallet. The little fob can easily fall out of my wallet, so I designed an adapter. 

The key fob just clicks into place and held lightly. Once put in a card slot it won't fall out. 

Note: The keyfob itself is quite thick reaching 5mm, but the main black body is 4mm. I've tried to design the fob to taper as to not stretch the card slots so much.

Print settings:

Layer height: 0.12mm

Material: PETG 

Infill: 15%

Recommend printing a bit slower and not at crazy input shaping speeds.