No they will not be made from 3d printer. They will be machined from a billet piece of material.
I couldn't find an o-ring that would work without having some custom made. I am going to make some from paper gasket.

I only have 10 bowls for sale. I am making 12 and keeping a pair for me. The company I got my billet piece from me required a minimum price per line order for each piece of billet material and the price point came out to 12 for the adapter piece and 10 for the bowl.
Plus machining 12 of the same piece is cheaper per a piece than just 2.