Looking at making a turd for my ar15. I have the send cut send files uploaded and ready to go. Does anyone have any experience with the printed ambi selectors? Is there a metal 3 position one that’s cheep that works? I wasn’t sure if the selector gets any wear and tear. I can print it in pa6cf or pla pro. I have the same question on the housing. Pla or pa6? Thanks in advance! Another question is I think I have a high shelf. Will it work with the high shelf? If not can I modify the receiver to make it work?