I know it’s not a new problem, but I don’t know what I can or should do…

I’m made a design that I shared for free on thingiverse under a Creative commons, attributions, non-commercial license.

I’ve been made aware today that two etsy sellers are using my design, they didn’t ask me and they don’t attribute me. I don’t particularly mind that people print and sell my design (I understand the added value of it already being printed for the user) , but I feel it is unfair to buyers to not be made aware that the design is free and they could easily get it printed cheaper elsewhere (design is small, it’s like half a dollar worth of plastic).

It would also have been nice to send me a share of the profit made from my design…

What can I do or should I do ?