VW Audi fuel cap

The original cap threads fit my Audi but the grip edge is too big diameter. I made this remix eliminating the edge grip and substitute a flat section grip. Best way to print is upside down. It needs support because of the fin. If you can block support on the internal space is best but it still works fine with support in there, just takes a bit longer to print. The groove for O-ring is unchanged but I made a small washer from 1mm rubber sheet, works fine. You definitely need an O-ring or washer, if not there fuel can slosh up on cornering. Probably only a few drops lost but you can smell it which is a danger sign.