I've found that for some games that primarily use the triggers, it was hard to get a grip on the controller. So i designed this to help out, it's not perfect but it's better than stock atleast.

i've printed this with pla, designed to print with supports at a 45 degree angle. The flat spot on the top of the controller is the main point of contact with the print bed. I use a lightly sanded smooth PEI print surface for good bed adhesion.