Long time ago I printed some of these screws just for me, with the aim to improve my designing skills, but I don't know why, when you pick one of these and starts to tighten and untighten, you can't stop. It's something hypnotic. I took some of them to my office, and the result was exactly the same. The people took one of it and starts playing with them. It was amazing.

Hope you enjoy this model as much as I did designing and printing it. And of course if you decide to print it, please share your pics with me, you will make my day.