EDIT: Better version here http://www.thingiverse.com/thing:1090368 by TheLongRunSmoke!
Why use a plain old dice when you can have an awesome dedicated turn counter!
I made this to work for Warhammer 40K, so the max number of turns is 7 and there is a day/night marker.
Its intended to be assembled with glue once painted. The wheels should snap on each number because of the little clicker arm thingies (no idea what they're actually called in engineering). You might need to sand down some parts (especially the clickers) for it to turn smoothly.
EDIT- Final version! (at least for now). Printed the WIP version and didn't like it too much. I thought it could work fine without a bottom cap but I was wrong, so this new version has one, as well as better dimensions on the clicky things and the wheels so the clicks are solid and satisfying. Also; minor cosmetic changes on the handles.
It still need to be assembled with glue and will still probably require a little sanding (especially on the top cap) but overall, I'm happy with how it looks and work for now.