Reprap Smart Controller Skull Knob

Skull knob for a reprap smart controller, the knob on my controller is approx 5.9mm in diameter. A picture of the knob is included. Before you print be aware that my reset button doesnt work so the bottom of the skull is slightly covering the cutout of the case I used, you can easily shave off a few mm's using tinkercad or any other CAD software.

Smart Controller: http://goo.gl/03cLJJ
Case: http://www.thingiverse.com/thing:361089