Swirl Jar

In my design business, I often times have to develop threads.  I wanted to see how fine I could go with a 90degree unsupported thread, and make a functional little jar  This is actually a pretty nice size, maybe 3/4 of a cup in interior volume or more.  The threads have a lot of engagement, so you can really screw the cap down.  I have two different jar designs that use the same cap.