This is a Chicken Head Knob, or Pointer Knob. These little guys will fit right on your lcd display of your printer. As a guitar player, I love the look of vintage tube amps, so I wanted to bring an aspect of that into 3d printing.
I printed mine in black, which is most common. There is a version with and without an indent/marker, which you could paint white. FDM printers may have trouble printing the marker because of the level of detailed required to do so.
The author hasn't provided the model origin yet.