Building your own Iron Man Suit? Here's the Right Elbow Armor the Iron Man Mark IV suit. The Right Elbow armor is different than the Left Elbow Armor, so don't mistake them as being the same. The joints are flipped. These elbows were made to go along with the Iron Man Mark IV Forearm - https://www.shapeways.com/model/edit/1323239/
Designed to print at a thickness of .72mm, (minimum for Strong Flexible Plastic is .7mm). This saves on printing costs and WILL need some reinforcement on your end. Most people use fiberglass resin.