I just down loaded and opened your file and it seems OK, does this look right.
I guess this is after running Crl+b. If you have this problem again can you export before running Ctr+b and upload, you might have found a bug or it could be something else, without seeing the file it's hard to know. The problem showing up after exporting the STL could be a consistence, opening the file after a save will sometimes find an error that was there before the save.
Thanks Mark
Mark Hughes
Owner, Hughes Tooling
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.