This is the location for Wikis related to Bentley product interoperability with non-DGN format files.
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Please post your inquiry in the FileFormats Forum and a colleague can assist, you may consider uploading and example DGN, a result .STL and the full version number of MicroStation you are using
I am having problems viewing STL files exported in microstation and trying to view it in a free STL viewer called minimagics the files seem to be frabmented. does anyone have any helpful tips in order to export STL files successfully?