Hi - I am new to shapeways and need to have some of my parts printed. I do own a 3D printer so I am familiar to the process of designing and creating objects. However I only print in PLA plastic and it wears down very quickly and some parts don't seem to print correctly. I have a few questions before I order my prints. - What is the most durable and strong material ShapeWays makes? - How accurate are the prints from the certain materials? (from question above) I am printing a shaft for a multipart project and there is a hexagon (pictures below) that fits into the inverse of it. Should I make the dimensions of the hexagon on the shaft much lower than on the inside of the part or am I able to get a accurate print and able to print the exact dimension? Thanks Nate