Lego Sherlock Holmes figure focuses a light beam on a Lego criminal with a small magnifying glass.

Lighted LEGO Fidget Spinner

Fidget spinners are a toy craze these days, and many tutorials on the internet show how to build LEGO versions. I wanted to make my own LEGO spinner, but with Light Bricks added. Since the Light Bricks add significant weight to the spinner, I chose to base my design on ball bearings glued into a Circular Plate (4 x 4 with 2 x 2 Hole, part number 11833). I purchased ball bearings from, where I found either part number 12925 ($5.77) or R-1650 ($5.77) to work well. I attached four Light Bricks in different colors to the spinner. In the video above, a red and green set are spun. The result at high spin rate is yellow circle, with the green and red blending together. However, the video frame rate makes the circle appear broken into segments. Then in the video at the bottom is a fast color changing LED being spun. The color changing and blinking of this LED create interesting dashed patterns when spinning. Instructions on making custom-color LEDs are in Chapter 2 of LEGO Optics and kits are in the Marketplace entry on my blog.