Spinner ninja star shape with bearing

This is a spinner toy made with a bearing, made by Calvin de Klerk. The bearing used for this spinner is a default bearing that comes in many skates. Its dimensions are 22mm outer diameter, 8mm inner diameter and 7mm height.

There are a couple of STL files attached for direct printing. There is a flat, easy to print spinner. And there is a sloped/skewed version that requires printing both sides and gluing together. (note that the half needs a mirrored part to create a full part). 

However, I recommend using the FreeCAD file to tune the model to fit the bearing you have. The spinner is parametric for the bearing part. The arms however are drawn free style, no constraints. The nr of arms are parametric though. So creating one with 2, 3 or 5 arms is easy enough as FreeCAD's PolarPattern is used for that.