Caliper and tweezer holder derived from LighteningPhil's version

This is a slightly modified version of LightningPhil's version here:

http://www.thingiverse.com/thing:7206

The left-most hole has been widened to allow my tweezers to fit into the holder instead of another allen key.

The left hole now has been elongated to a 6mm designed width. Once printed this will be slightly less of course.