SPD-SL road cycling cleat for cycling shoes. Modeled after the yellow cleats (which allow 6 degrees of free rotation).

I have printed one and checked that it fits a matching pedal, but nothing more. I plan to use these for indoor cycling first to see how they work. Other people have said they have tested these on real bike rides outdoors, but I haven't heard results of any long term use.

If you do so, please let me know how it works out.