Civil 3D 2021 crashes with no error or fatal error when I attempt to export my pipe network to a .stm file

[ewestU85DC]

I have attempted to export this pipe network as a whole, as one pipe or structure, from different drawings and so on. No luck, each time as soon as I try to save CAD freezes with no error message or fatal error and needs to be restarted. Any suggestions appreciated. 

[Wojtek_Garczewski]

Hi @ewestU85DC 

Thank you for posting us. Have you tried the following:

1. Export that problematic Pipe Network to LandXML.
2. In the new drawing import it back.
3. Export to stm.

Thanks,
Wojtek
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