How do the model Ratings work? Users may rate models that they have already downloaded from 3DModelSharing.com. Users may also leave a comment on a model that they have downloaded. All the comments are publicly viewable. A user can only rate a model once and leave one comment per model. If you can't leave a comment or rate a file that you know you have downloaded in the past, just click on the download link and start the download again, and then refresh your browser window. Why can't I leave a comment or rate a certain file? If you already tried downloading the file again, and the system will not allow you to leave a comment or rate a model, please contact 3DModelSharing staff via mcadadmin@ibsystems.com. We will try our best to help you.