Its absolutely garbage. Does not work on my clients files. FreeCad opens their files, etc. Purchased it and used it for the first time a week ago. Could not get one STL file to import. Do NOT waste your money on this garbage. Sketch it opens their files. I am not a novice, I am a seasoned user. Every STL file I have ever tried to import crashes. I have tried to do this on 4 machines and the same results. Just a warning to those that are looking to buy. Dont......