3D Printed Spiral Ejection Decompression Ball, Rainbow-Colored Spiral Spring Ball Set, High Precision 3D Printed Fit Shaped, Stress Relief Research Toy (Rainbow-7in1)

These 3D toys are fascinating! They are such fun to watch!!

Very small and doesn't work as nice as they show in the video. Returned mine.not worth the high proce.

It's really fascinating to watch these spiral shaped balls slide through the tubes. It's kind of an optical illusion where it looks like the ball won't fit, but then it slides right through. You can snap the parts together or pull them apart to create tubes of varying lengths. Aside from sliding the balls through the tubes, there isn't much else you can do. So, I'd put this in the category of a really good fidget toy. It is a lot of fun.

This is a good time suck for anyone that likes to fidget with little mechanical systems. A bunch of products have the gist of this, but this product extends what I've seen before into a stackable set of rainbow colored pieces that join into a tower and uses a spring to provide a little kinetic energy for the system.Everything, sans springs, are 3-D printed to sufficient tolerance to get everything to work. The pieces snap together and stay together. No picture or literature comes with his toy. There are videos and pictures on this Amazon page that shows you what you need to know. A quarter page picture, company name, and product description would help the presentation, though not necessary. For shipping purposes everything is packed very carefully. I don't think a piece could be damage short of severe actions against the box.Overall, a nice diversion.