Hi beanworks - those look like they may possibly be some damaged areas of the model, there might be some problems with the trimming boundaries of the surfaces in those particular areas. If a surface's trimming boundary loops around and intersects itself it can make stuff that looks like that - the "inside" and "outside" trimmed regions of the surface become ambiguous when the trim curves are self intersecting and if that's the problem you have then that can also affect 3D printing as well and those areas will need to be reconstructed.

Is it possible for you to post the 3DM model file, or send it to me through e-mail at moi@moi3d.com if you want to keep it private? If you can do that I can then inspect your model more closely to see what is going wrong there.

But those look like it might be something wrong in the geometry.


> The object properties displays it as a "solid" though.

That means that all edges are joined to other edges. But it is still possible for there to be other kinds of problems in a model like surfaces with self-intersecting trimming boundaries, that can make things invalid for 3D printing even though all edges are still joined to one another.

- Michael