Hi,
I’m totaly new to 3D modeling and printing so please forgive my weird questions 
I need to print a fin for a stand up paddleboard I’m using for river running, it has to be very tough as it will be strongly shocked and slided on rocks. What material should I use? ABS or nylon looks to be the choices?
Plus I wonder if 3D printing is “full material” or hollow?
Thank you!
