If your having trouble thinking of a creative domain name, try using this outline to boost creativity: 3D[specialty][state located].com - example: 3DshoesNY.com or 3DpartsMN.com. It would be best to find a domain with two words (3Dprinted.com) that's available, that you could own both the 2 word version and the 2 word state specific version (3DprintedCA.com). Hope that helps.
-Mike