As the shop is a community resource, use of it for significant personal gain is not acceptable. You may certainly sell things you make there, however if it appears that you are running a business, even a small one, we will ask you to stop making money off of other member's resources. To try to explain this: at work, your boss probably won't mind if you photocopy or fax a couple of items, but if you start printing out an entire book it's no longer ok.