I think they meant trademark, but you don't have to sell something to be culpable for IP theft. Typically, fair use covers things like this when they are sufficiently changed from their original form, but you only attached a trademark to a model, neither of which you own or have sufficiently changed. CC allows you to remix parts so no problem there so long as you use the same restrictions as the original, but I'm positive that the NFL has not granted you a license to distribute their property, regardless of whether remuneration was at play.

This isn't an attack, just an educated observation that you need to consider. As a point of view - not a threat, I could care less about Ohio or football - I have a family member that works for a large corp and their job involves shutting down illegal uses of their company's property. They sometimes allow minor uses like small things on etsy or eBay, but once any legal agreements (CC) or scalable operations (shirts, prints) get involved they take action. And you should know that Thingiverse will not risk litigation for an obvious CC violation.