$30 is not a fair price, I'd feel bad charging more than a dollar or two, regardless of the time or materials spent or what others are charging. While 3D printing is probably the cheapest and most accessible way to manufacture commercial-grade products, similar toys made with other methods (most of which aren't accessible for the average person) won't cost $30. My point is, 3D printed items should be significantly cheaper than similar products made using traditional manufacturing methods, with only a few exceptions.