Although it looks a bit chunky and cartoonish this knob is quite functional to use.
The allen key provides a way of spinning the knob really fast and the bolt head some fine control for the menus. With such a big head is also very easy to press the button.
Try it out and see!
The allen key is a separate piece so it can be easily removed if needed.
All the pieces are meant to be printed without support.
The allen key is divided into two pieces and can be put together later with a friction fit or a bit of glue.
The author hasn't provided the model origin yet.