I need some advice on my design for a tablet holder that I want to get 3-D printed using a printing service, not my own printer. I need to decide which material to use and how thin I can make it. I asked for advice already on a 3-D printing forum, but they could only tell to find out through trial and error, which is not practical for me without my own printer. Basically, I have a 12" x 8" rectangular surface, with four smaller rectangular sections cut out, making a frame with a cross in the center. I have included an image file of my very rough design (this design doesn't yet include the side supports). I want to know how thin I can make the surface, and also how narrow I can make the sections. I have considered using nylon, which seems to be a very popular material for 3-D printing, but I'm not sure how strong it is. I might have to use something like aluminum instead. Actually, I would love to use carbon fiber, but I can't seem to find out if it can be 3-D printed. I would probably have to order the parts, and find a machine shop to cut the pieces to the right sizes, since I don't really want to mess with fragments of fiber. I need to be able to support up to 2 pounds. I will be attaching this holder to an articulating camera arm with a tripod style connector. The connection will be made at the very center of the holder. Any suggestions are greatly appreciated.