MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Wow, eBay did the right thing. You need to read up on which license applies because you are not allowed to sell it since it's listed as non-commercial. As a designer who puts many many hours into designing great designs I also share many of my designs for others, like you, to enjoy for free. But I do not spend all these hours designing so others can make a profit.
Instead of trying to earn money for yourself why not leave tips more often for designers putting in so much effort and time making designs for you to enjoy? In all years on thingiverse I think I've only ever gotten one tip which wad immensely appreciated. I myself tip quite often for designs I enjoy because I know it often takes a lot and many prototypes to make a good design.
But I'm glad you like it. :)