Wine bottle screw top

This top will fit most current screw-top wine bottles. It is designed to have an O-ring inserted to provide a good seal. I used O-rings with 3/4" inside diameter 1/8" thick and 1" outside diameter. The thickness and outside diameter are not too critical, but the 3/4" (19.05mm) inside diameter makes a nice fit on the centre of the thing.
Note: I have replaced the original file with an updated version which is a better fit; the centre spigot of the original was too big for some bottles. There are two versions, the "Gsr" version has nicer rounded edges on the top but may not print so well without a raft.