RFID Fob keyring holder, easy print. fully parameterised

Behold! the super simple RFID fob. Suits any material. includes inner void for the RFID sticker.

Use your slicer to set a pause once the walls of the void have finished printing (just before the top starts).

The most recent version of this model is available here: https://github.com/SnowballsChance/flexi_fob

Thanks to the  BOSL2 team for their handy-dandy library.