Relevant Video

This fascinating desk toy highlights the strange property of a straight pole fitting perfectly through a curved hole when spun around a central axis. It's a simple, no frills illusion, but it sure is satisfying to watch!

This download includes all parts necessary to assemble this model. Some glue required for assembly (I like to use E6000 adhesive, holding the pole in place with UHU putty while it dries)

03/20/18 UPDATE : Added an 'upright' version of the pole model. I've found that printing this way with minimal supports at the very bottom produces cleaner results on many printers