This is a simple two-piece snap-fit case for the Adafruit Feather boards.
It should fit all of the feathers that hold the basic shape except for the FONA (which is much longer). I have tested it on the M0 RFM69 and the M0 Bluefruit LE.
This is a quick design based on my recent Trinket snap-fit.
I have included three tops - Adafruit, ATMakers, and blank