Measure Parts in STL Format with a Digital Ruler

Sometimes you just want to take a couple dimensions off a part, but you ONLY have access to the STL file.

It's difficult to convert an STL file back into a 3D geometric object. (It can be done to some extent but I don't want to purchase and install special software to do a quick and dirty task.)

In times like this I've found it useful to load the part in question into your printer host software (Repetier Host for me) and measure it with a 'digital ruler' STL file.

The ruler provided