Tri Shuriken Spinner

I wanted a ninja-star spinner that still had the counter-weight of 3 bearings. The normal spinner is pretty large and requires big hands to spin (11 cm diameter). The smaller spinner is much more compact and is suitable for anyone (including children).

Standard 608 (22mm Diameter, 7mm height) bearings will pressure-fit, and caps can be printed from other projects (The caps from http://www.thingiverse.com/thing:1798896 are great!)

To get rounded edges, I ran a minkowski addition to a flat-i