I think you want to merge them together. Try MeshBooleanUnion Command This will melt them together. if Both Meshes are Closed then this will also create a “WaterTight” object
If you want too merge other objects than meshes use BooleanUnion itself instead of MeshBooleanUnion
Thanks also to @Willem, although this is really a different question.
What I want to do in this case is print a mesh inside another mesh, and I was just wondering (for the sake of structural integrity rather than actually getting it to print) whether it would be best to link the two meshes together.
Conceptually, I effectively want to print a round mesh “hanging” inside a larger round mesh - how would I create the supporting edges between the two?
For rendering it is needed some times too - for example a glass sphere with a thickness. Simple _join the two meshes and they are handled as one object. Best check the surface normals before if needed for the final result.
sounds like you just need to draw a few lines from a few of the vertices of the outer object to closest vertices of the inner object. then either pipe or apply curve piping and mesh/extract render mesh.If you want smooth transitions you should look into grasshopper and its plug-ins. (or t-splines)