Quick question for 3d printing

Set up:

I have two different shapes in polysurface format.

I want to print

Which step do I need to take.

Mesh --> merge --> ??

besides I can’t merge or combine the shapes (as in solidworks assembly), I have naked edges and don’t know how to solve them

See my reply in your other post. When you still have questions after that, please post the 3dm file for someone to check.