Mesh Difference fails

Hi, I am a student and have some problems making a prosthesis for a dog. I have available the mesh of the dog and the mesh of the prosthesis itself, but the mesh of the prosthesis itself is a volume (as can be seen in one of the photos below). I would like to convert this volume to a shell. I tried this by subtracting the mesh of the dog from the mesh of the prosthesis itself with Mesh Difference. I have also already applied the same method with Brep Difference where both meshes were converted to a brep, but this also did not work. Could someone help me with this? I have placed the program in the attachment. Thank you in advance! :))



Laatste versie prothese.3dm (2.8 MB)
Laatste versie prothese.gh (26.2 KB)

This could be one way:

Thank you very much for your quick reply.
I have one more question: which plugin would you have used for this?

component OFFMESH is in Pufferfish | Food4Rhino and TRIMESH is a native component from RH7

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