Hi Gianrico,

I guess, it's rather an issue of translating a file by iges2step converter. It apparently writes a solids as a separate surfaces into the IGES file. Then, when you import the IGES file, those individual surfaces are automatically joined into a solid (note, that this MoI's feature can be turned off in moi.ini under the section [IGES] JoinOnImport=n ). However, Moi seems not to be able to properly join all surfaces together into the solid. Maybe the trouble is, there is no clear what part should be joined due to the overlapping edges of surfaces(?).

Petr