I intend to use for dice in a steam punk game.

Printout five of the shutters. Printout one each of the decorated body that retaining ring and the locking ring. The assembly STL file shows you how these go together, though I have only shown two of the shutters.

I used five M3 x 25 mm countersunk screws to hold this together. My printed version works very smoothly though your clearances may vary. It is possible to put this together with out the retaining ring the screws will hold the shutters in place by themselves. This shows off the mechanism more. I intend to add some decoration to the locking ring and the shutters so this is still a work in process.