prints fine on my Mk4s without supports at .15 layer height.  My PLA prints were a bit too brittle, I'd recommend other materials such as PETG or PCBlend. ABS would probably be fine

This allows for very strong attachments to the thumbstick that won't fall off with too much lateral force. 

the joystick attachment area is a 15mm wide hole with the following thread settings. I've also uploaded a blank nub, as well as an stp file of the blank numb so you can just design your own tops for it without messing with the threads.