Every Element in the library has been tested for its 3d printing integrity. I use a Blender Addon that assesses each mesh, and I’ve run this on every Element before uploading them to the website.
That being said, once the Elements are combined in the Builder, and once they get exported there are going to be rare occasions when Slicing software perceives an error.
In my experience these errors have never stopped my printer from producing a clean print.
Rest assured that we’re looking into what we can do during the export process to remove errors altogether.