it was ruled that it would be legal to 3d print paddles that allowed you to hit the buttons on the back. My question is would it be legal to cnc these parts.
Superficial additions to the VEXnet Joystick are legal, so long as they do not include any physical or electrical modifications to the original Joystick itself. That is, if the parts were removed, the Joystick would be indistinguishable from a standard Joystick. There are no restrictions regarding the material type, manufacturing process, or functionality of these additions.