MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I took the model you had, doubled it and aligned it in Simplyfy3d, then used OpenScad to make a ring and put it on top again with Simplify3d. Going to be printing out a bunch of these to hand out at this weekends qualifier.
I printed these on a Tevo Tornado with a volcano 1.2mm nozzle, the big one is .4 mm layer and the small one is .6 mm layer height.