I am an undergraduate physics student and I've been working on a personal research project for almost a year which has turned into a design for an invention. I am waiting on a physics professor and a friend who's a mechanical engineer, both very busy people, to review my design and tell me if they can find any major flaws (Both have given me positive feedback on the preliminary idea but haven't had time to review the "finished" proposal yet). In the mean time I am continuing my research and seeking input on my design where possible. I currently have no means to procure even a provisional patent, but I'm far too excited about my idea to drop it, and there's a lot of work to be done optimizing it. I live in the US and I'm asking this both because I could use some advice and because it seems like an interesting topic for discussion anyway: how does one with a (hopefully) good idea and limited means seek input on a process or invention without publicly posting the specifics?