To delete those I'd probably try selecting the faces that are surrounding them , then use Edit > Separate to break those apart from the main object,then join them back together leaving those ones behind.

- Michael

Thank you! Fixed that parts and all work fine!

Hi Tolya, that's great!

Do you by any chance remember how those particular surfaces were created? Did they come from a STEP import or were they modeled inside MoI?

There is probably some kind of bug in whatever process created them, but it is hard to know where just looking at the end result. If I was able to repeat the steps that created them that would make it easier to find out what went wrong and try to fix it.

Thanks, - Michael

This object can get this errors, when I do fillets for this element in spaceclaim

Hi Tolya, if you have the file for that object that was exported out from SpaceClaim can you please e-mail me a link for it at moi@moi3d.com ?

Maybe it can be solved by some kind of tune-up to the MoI importer.

Thanks, - Michael