I just wonder how am I supposed to fix issues with the scaling? Don’t have a practical exampel when it does not work yet but is very curious because I don’t hear him mentioning how to fix this. Maybe I just missed it but I can only find that he said that you should consider not to do any scaling operations if the receiving software can’t handle it. WHAT 
how am I supposed to make a model and not using one of the most common of all of Blenders commands???
Oh, sorry the solution will come in next chapter. 