Abstract: According to some aspects, system and methods for generating a 3D model shell is provided. The system may include a memory and at least one processor coupled to the memory and specially configured to morphologically dilate a 3D model by a dilation distance, create a first copy of the 3D model and a second copy of the 3D model, perform morphological erosion on the first copy to generate a first shrunken model, perform morphological erosion on the second copy to generate a second shrunken model, and subtract the second shrunken model from the first shrunken model to generate the 3D model shell.