The Corkscrew is famous in the world of motorsport. It’s a challenging left-right turn that drops dramatically as you’re turning. I have scaled it down to a Radius 2 (R2) left hander and a Radius 3 (R3) right hander.
You can see it in action on YouTube here. here (22sec).
You can download the stl files, for the price of a cup of coffee, and print your own here.
Thanks for having a look.