This thing is the ultimative Wacken:Open:Air keychain. Print it with flexabile filament and you'll always have the Wacken Skull in your pocket!
Print this thing with 100% infill. This will result in a resistant yet malleable keychain.
Supports are needed for the loop.
Use whatever resoltution works best for you. I've used a rather high resolution of 180 microns. This was due to the slow printing speed needed for flexible filament.