Hi all,

I have 2 .stl files which are 2 organs of the inner ear. They are segmented from CT slices and exported separately as 2 .stl files.

Some parts of the 2 organs should be contacted physically and they should share the same surface in the following Finite element modeling. However, they are 2 separate stl files, and the 2 surfaces are crossing with each other at the boundary. Is there any way to merge them together to let them share the same surface at the desired part?

The sketch is attached. The stl files are 3D surfaces, and the sketch is the cut plane of the model to illustrate our problems. Thank you very much.

Please see the mesh files below if it could make the question clear. Thanks a lot!

Yes. Actually, I want to do the modeling and only one surface can be at the interface. So I need the methods to detect close surface and merge them to be one.

Ke Zhang wrote:

Yes. Actually, I want to do the modeling and only one surface can be at the interface. So I need the methods to detect close surface and merge them to be one.

Not sure if anyone here would give you a good answer as I don't know if the surfaces from your sketch are flat or curve

you'd better provide a 3D model to show exactly what you want

Thank you so much for trying our model! This is a really tricky question and difficult to solve. Maybe we should expand the inner part of this model and use boolean to cut and forcibly let the 2 parts share the same surface. I don't know if this is a good way to do it.

Ke Zhang wrote:

Thank you so much for trying our model! This is a really tricky question and difficult to solve. Maybe we should expand the inner part of this model and use boolean to cut and forcibly let the 2 parts share the same surface. I don't know if this is a good way to do it.

Ke,... I attached the sldprt .. that closeness of the two will give errors.. so.. the other option is to offset/thicken/scale one to have them interfere..

A good safe place to start is to make an intersection curve of the surface intersection. This will help to visualize where the two pieces need to be trimmed.

You can make an intersection curve in a 3D sketch. There may be other ways.