Problem with volume intersection

Hello everyone, my intention is to build volumes above and below the cellular structure as supports. Intersecting the volumes generated with the volume intersection function. I am able to get a desired volume but when saving in STL I get an error where the export is not suitable for rapid prototyping. Where am I wrong? Can anyone give me some advice? Thank you.

Now a fifth thread on this topic!!? Your strategy is not working.

Sorry if I was a little repetitive, but they were about different problems even though they were the same job. I am new to the platform and I am looking to learn.