Counter with Auto-rollover

EDIT: The normals of mtg-star were flipped inwards. Should print correctly now. I've also made a cleaner version of mtg-number2.stl with less janky geometry (and much tighter tolerances, since 3D printers have come a long way since back when I published this)

EDIT: updated number wheel with the solution by [Vano7750/Ivan Sitas](https://www.thingiverse.com/Vano7750/about) for a better overflow handling. Just use mtg-number-V2.stl instead of mtg-number.stl

[Here's a video of it in action](https://youtu.be/bDUjR9JXZ9M)

The ten's digit automatically rolls over thanks to an embedded geneva wheel, courtesy of [jessed](http://www.thingiverse.com/thing:27974). (Parameterized gears by [LeemonBaird](http://www.thingiverse.com/thing:5505).) (yay public domain!)

The original purpose of this was as a life counter for Magic: the Gathering. It's scaled in *just* the right way that it would fit into the lower half of an MtG card.
Depending on the tolerances you get out of your printer, y