This design offers two options to keep the Toyota PRIUS smartkey* on your belt. It maintains free access to buttons without he need to remove it at any time.
The One-Piece design is easier, which you just print and use; it works with most belts, however clip may not press enough with jeans (without a belt), that's why I decided to try the other design.
The Clip Press design works much better with, or without a belt, it uses a spring to keep continuous pressure, however, it is more complicated to print because it consists of two parts (body + clip), and it requires a spring, and a metal axis of 2mm diameter plus some assembly skills.
Choose the right for you.
(* PRIUS model 2015, not sure how much other models have changed)