Hi Citarra, do you mean it would not Shell? Shelling tends to be a fairly delicate operation, if you have any spots on your surface that bend around too tightly shelling tends to only work with small distances.

Can you please post the .3dm file with the surface in it that you are having a problem with? That will make it easier for me to check out what is going on.

You will probably have to alter the surface to be a little less bendy to make it work. Shelling in general is not really one of the most dependable functions in MoI right now, I need to collect up examples where it does not work well so that it can get improved.

- Michael