Need more information mate.. thats VERY vague. What materials you making the props from.. what machinery are you using.. Are you carving them by hand... What aircraft are you designing for.. what size range..
If you are planning on 3d printing props that is generally a really bad idea unless you have MUCH experience with engineering and design to work out the stress of rotational forces so it holds together. spinny blades O deaths are not fun when they self destruct and come to kill you.