Our poor duck we rescued from a farm has a bum leg. It disjoints at the knee and she falls over a lot. I really wanted to get her a knee brace so she can have a normal life but I can't find them anywhere. Wish I was more versed in 3d printing. Any ideas? Splinting it will not work as it's an old injury and will never heal. I don't want to cull the poor sweetheart.