Swinging back on this, the elbow shutter never really worked out. Even in the flexible filament you couldn't flex your arm. I can hunt down the files if i still have them however they were a very quick CAD drawing and not screen accurate or anything like that. I think the best bet if I can find the original file would be to print it out in standard filament, make a mold hard mold, and use it as a negative to cast some dragonskin silicone.