Gauge for 3D Light Cube 8x8x8 Jig

Because I know that my printer doesn't exactly have the best accuracy when it comes to printing holes, and the jig for the 8x8x8 LED cube requires quite a bit of material and time to print. I thought it would be a good idea to print just one of the holes first, in order to see if I need to do any adjustments before printing the real thing.