I got an Olympus Air for my birthday, but my Nexus 6 only fits barely in the default hook that comes with it. Fortunately the hardware specification is available online which have sample files for creating a case for the iPhone. Kevin McCormack created a Nexus 6 case and graciously shared it on the thingiverse. I was able to combine the two and create a new model, which I uploaded to Shapeways where it is now available if you wish to print one (the "Buy" option is "at cost", I have no shop there and will not make a profit from purchases). You can also download the model if you wish to modify it or print it yourself.
I haven't yet tried it, but the Olympus Air fits well, and the new case is slightly smaller. The phone fits well in it, and doesn't move.