Fitbit Air 20mm Strap Clip
At the time of publishing the only bands available for the Fitbit AIr are wrist bands from Goggle. This thing is to allow the use of the commonly available 20mm wide bands without device specific mounting. Ex Polar Loop, Hume V1 and I'm sure others.
I used M2x20 screws with nuts to attach the band loops to the Fitbit holder. Looked at print in place and filament as the hinge. Both were fragile due to the overall size.
The Loop has a designed in brim. It's a very small part and this way you get the benefits of a brim and something a bit easier to remove than a slicer brim.