Mesh creates holes or negatives

Hello please help.

this happens to me in every sculpt. not only on this course but it seems to happen every single time i use blender. can anyone tell me what im doing wrong? in this case ive followed exactly what Grant has done.

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First thing to check is all the normals are facing outwards.

Then check for holes in the mesh too.
Double geometry also worth a merge by distance check.

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If it does turn out to be what NP5 is suggesting, this might help to explain why:

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The 3D Print add on can fix geometries, holes, non-manifold meshes, etc. It’s part of blender, and needs to be enabled.

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