I too have an interest. So, while at Chicago I talked to Ron Snyder, who I have great respect for, from InTech. The company who is contracted with 3M to print all their models. I asked him that same question and the answer I got was not the one I expected. He told me that all the material claimed to be used for splints is not tough enough and they all break. He told that he himself really wants a material to print for splints. Two reasons that he wants a product for splints is first of all InTech makes their living printing and another reason is that he would have a very large client of his send them "a hundered splints a day". So that conversation was very informative but burst my bubble for splint printing. I also talked to another large lab who does splints and was told that they mill their splints. So, I have to respect both their input because I know they have both done their research. In conclusion there is at this time no material suitable for printing splints no matter what the suppliers say, and they will say anything because the want to sell you their product. Sorry to ramble.