This is an extended bracket for the popular 3-in-1 sleeper chair on Amazon and other sites. This bracket is meant to replace the small metal L-bracket that prevents the ottoman from pulling out too far and having to be realigned. I'm not sure how similar different brand chairs are to each other, but see the picture of the bracket that is being replaced above. 

Printed in PA6-CF, something reinforced is probably best. Print orientation is intentional for maximum layer strength when in-use.