On many websites that host 3d models, you can set specific licenses for what you upload, such as non commercial use. Say there's a frog model with a no sell license. It would be illegal for me to sell it, obviously. But is it illegal to sell my 3d printers "time" and then the person decides they want the frog printed? I'm not technically selling the frog, but rather the material and time to make it. Any thoughts? (PS this isn't something I'm currently trying to do, just a random late night thought.)