I was going to replace a joystick with a loose return spring but it came with "deluxe thumb joysticks" and the replacement sticks I have on hand have the larger plastic stick so I couldn't just swap the original Joystick caps because they were too small. I recreated them as close as I could in FreeCad and in the slicer I added fuzzy skin the Thumb rest to give it some extra texture. After printing I taped off the rounded base and sprayed the thumb rest with rubberized plastic dip to give it bit more grip. Designed for an Xbox one style controller.