Science Olympiad Towers Ring Gauge 2018

From the Science Olympiad Rules for 2018 season this is a "Circular ring gauge with inside diameter of 8.0-8.1 cm, not weighing more than 10 g, that retains its shape and flatness when handled (5.f.)"

Version 1- Made in OpenSCAD has been printed (seen in photos), I've added one modification to the *.scad file to make the slicing a little less angular.

Version 2- Created in Autodesk Inventor, I added a handle and an embossed name.