My tailgate bumper on my 2019 F150 kept falling out. I bought another one but the same thing happened so I printed a new pin that is a little longer and holds the bumper in place. This piece is pretty small and the outside piece should probably be printed on it's side for strength. It doesn't flex real well so I had to print a couple but they print really quick and once I got it in there it has worked great for about 6 months.
Update: I've had this same pin installed for about 3 years now and it has been working great. Hasn't fallen out once, it just does it's job.
The author marked this model as their own original creation.