Regular Rhombohedron Helical Pass-through Toy

I am publishing a series of similar fidget toys in other shapes but with the same helical geometry, so they all can mesh together.

These regular rhombohedron helical pieces simply thread into themselves. You may thread them through the center bore onto a standard wood pencil or the included optional skewer to assist aligning for assembly, but really just another way to fidget. Spinning them on a shaft can have unexpected and entertaining results. Not all pieces spin equally freely. Detailed cleanup makes a big difference.

The clearance between pieces is very close. High temperatures can cause fusing. I advise low temp material (PLA) and placing on the bed near the open door to maximize cooling. I find on the smaller models you can also increase the cooling time for each layer by printing 2 or more clones simultaneously.

Friction between the surfaces will reduce with cleanup and use. I recommend a small round file to clean the center bore and a deburring tool for any artifacts on the edges. If your print had any fusing between pieces, you may also be able file away resulting roughness. 

On these particular regular rhombohedron models, I find there is too much friction for the three pieces to mesh as they spin. 

I've posted a YouTube video with some demonstration and some cleanup instruction.