I bought this piece as a test piece since I don't have much experience with 3D printed items. I chose the white nylon plastic with the smooth matte finish. I just received this item today and I very impressed. I ordered the rest of the kit. Sir, you have a true skill in modeling and my "hat" is off to you. Thank you for doing this kit. Again, I don't know much about 3D printing but if metal could be an option, that would be nice.