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.
Thanks for your comment... I actually have a coin weighted fidget spinner posted as well at https://www.thingiverse.com/thing:2323309. This allows you to vary the weight to suit... and as surprising as it may sound 'the more weight the better' is not necessarily the case... particularly when you have a plastic bearing. Getting the 'right weight' is the key to speed and duration. Too much weight causes drag within the bearing... this design lets you experiment.
Have fun with it!