Spinners with Balls: Volume IV - 1/2" Balls

This is Volume IV of Spinners With Balls -- these spinner designs use 1/2-inch balls/shot instead of the typical bearings in each arm. One of these designs is my most aggressive design to date.

A detailed video of how these spinners were designed in Fusion 360 as well as a quick test of spinners is available at: https://youtu.be/4scjW-Qbo9k

My other spinner designs are available at:
Volume 1: http://www.thingiverse.com/thing:2251166
Volume 2: http://www.thingiverse.com/thing:2257685
Volume 3: http://www.thingiverse.com/thing:2260326
Volume 4: http://www.thingiverse.com/thing:2269281
Double-Decker Spinners: http://www.thingiverse.com/thing:2261906
Volume 5: http://www.thingiverse.com/thing:2293420
Volume 6: https://www.thingiverse.com/thing:2291313