Ok thanks for explanation. However the chinese were much faster in this project :)  http://www.ebay.com/itm/Intelligent-LED-Light-APP-Control-Hand-Spinner-Tri-Fidget-EDC-Toy-Focus-ADHD/292175346180?ssPageName=STRK%3AMEBIDX%3AIT&var=591112244714&_trksid=p2057872.m2749.l2649

Hello Axiris, Please if can share me Plexiglas laser cut file... Thank you.

Nice work :)

On the 3rd arm, with the LEDs, there are two holes that can take M3 Screws. I added washers and nuts until balancing was ok. It was hard to make a video with a smartphone. So i clamped the spinner in a parallel vice, pushed it and hoped to get a good shot. Then i cut the best part of it. Spin-time is much longer than shown. It depents a lot on the friction of the ball-bearing. It's not perfect, but fun ;-)

How is the balancing of the spinner since it uses batteries on 2 points only? From the video it looks it does not keep turining for much long?  Very interesting project btw!