9-12 Second Hourglass Timer

This is an hourglass sand timer printed with natural translucent PLA for the "glass" which completely encloses the sand.
http://www.youtube.com/watch?v=KmxJaU5Fkpk&feature=youtu.be

There are two versions of the glass; one with a narrower neck and the other wider. I used sand from a craft store, which isn't very fine, so I used the wider hourglass for the version you see in the video.
If you can find really fine sand, then try the narrow version.

Your time will vary depending on the si