So, I spent a couple hours tonight printing some stuff out for the interview. I got a copy of the I-864 package we emailed printed out, along with a copy of my supporting documents. I also printed out ALL email correspondence between me and NVC. I had I believe 17 emails printed out, including auto response ones. I know I probably will never need them, but I felt like printing them out regardless. I also printed off a copy of a DS-230 filled out. Doubt I'll need it, but whatever.
Once I have everything printed out, I'll take a picture of my folder and upload it here.