Make dozens. Give to friends.
The units are in INCHES not mm.
3D printer used: Dimension 768 BST
I realize there are others on here, but this one uses much less material, has text, and pinches the tube more to retrieve more paste from the tube.
I've actually been using this one for quite some time, but is bulky and the slot is over twice as wide. http://www.thingiverse.com/thing:1009