Customized version of http://www.thingiverse.com/thing:2104554

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=2104554

Using the following options:

ringsSeparation = 3
pivotTolerance = 1
innerRing = 1
innerRingText = Game Time
pivotDiameter = 4
textSize = 3
ringsWidth = 4
innerDiameter = 25
pieceHeight = 10
numberOfRings = 12
keyRing = 1
keyRingDiameter = 8