Deck railing was installed in such a way that the last post was too close to the house and the cap could never sit on there straight. Any gust of wind would blow it over.

I designed a replacement cap that has the edge cut off. It sits on there tightly and protects the post from water damage.

Is it perfect? Nope. Is it good enough that people don't notice the differences unless I point it out? Yes

I printed mine as it sits on the post, I wanted any mess from the supports to be hidden when in use. Not the most filament efficient method.

Hopefully this helps someone.