This is a post cap that fits over the top (not inside) a 2 inch or 50mm post. The cap was designed to simply cap off a post that was cut near the base and to cover the sharp jagged edges. It has no fillets or holes and is around 3mm thick. There is .1 allowance all round which makes it a tight fit on the post.
I have included that mesh files and the stl File as it was made with a cube part and a negative smaller cube part dropped inside it. if you don't want the mesh or you want to play with the original files, use them.
if you don't mesh boolean on you design it doesn't include the negative part.
printed PLA basic on a x1c standard nozzle.