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STEP files for 3D printing

Hi all,

I have some broblems with STEP files exported by Pro E. When I send Step files to 3D printing service, they replied that they are not able to print them. They said "the file opens as 271827 "shells" which supposed to be only "1". number of "holes" should be "0", but there are 280523. " I can't find out what happen.
I have uploaded one of the STEP files and feedback from 3D printer. You can find them by clicking on the following link:

Suggestions welcome.