What is proper to do with Attribution? I want them to be free, etc., but not sure about commercial use considerations.

It depends on what you want. You want them to be free. But do you want the recognition that you created them? It can (partially) avoid that someone else redistributes them and says he created them, maybe even sell them. It requires that you follow up on infringements and take action against it.
That's why I distribute all my models in the public domain (CC0 1.0 Universal). Someone can still try to copy and sell them but I can't be bothered by it. If I see it somewhere I can report it but I am not going to waste time with witch hunts against offenders. By clearly distributing my models in the public domain (see dodecagon.nl) I can avoid most wannabe's that will try to make money from them.