This is by far the most complicated casting I’ve ever designed. And was really surprised that it poured on the first try.
Here is the 3D printed water core, ports and combustion chamber.
These are the 3D printed parts all assembled and being incorporated into the surrounding mold. I design this way to save a ton of money.
After the pour.
If you want an idea of how detailed 3D printing sand can be check out this lettering.