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This part is useful if you want to get wiring from outside the grip to the inside of the grip or vice versa. This part for instance.
Disclaimer:
Plastic isn't as resilient as the metal of the grip. If you can make those parts out of metal: do. Otherwise consider resin. If it's not an option, don't be cheap on the plastic. For all structural parts: use PLA or better, go 100% infill and print with an angle (potential crack to filament layer). Adapt the joystick response curves so you don't yank your stick like a mad man. Then it'll be fine.