Hello. I'm a patent attorney in private practice (I don't work for a company), and I'm doing some research on patents covering 3D printing in the US. More specifically, I'm trying to develop a list of the patents that people in the 3D printing field believe are holding back growth or preventing the introduction of new, lower-priced products. I'm not working for a client on this. It is just a matter of personal interest to me, and I'm thinking of writing an article on the topic. If you have any patent numbers or other information that you would like to share, please post a reply. If you wish to respond privately, you can email me at sross@rossjoynerlaw.com. Many thanks!