Hi, I am currently looking to get some work printed on an EOS SLS machine. I have other companies providing quotes. As I am new to this, I have many questions. What I am trying to produce is discontinued fuel cells for ATV machines, and various other plastic parts. I've already paid Konica Minolta good money to 3d laser scan these parts for me. So my questions are: 1. Are any of the materials used by shapeways fuel proof and applicable to my need? 2. Can my STL files be made private, I don't want others being able to print them.