Measure Parts in STL Format with a Digital Ruler

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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, although it can be done to some extent. However, I don't want to purchase and install special software to do a quick and dirty task. In situations like this, I've found it useful to load the part in question into your printer host software, such as Repetier Host for me, and measure it with a digital ruler STL file. The ruler provided has 1/4-inch increments, but you can scale it to measure any increment you want. In example photos, I measured the hole spread (3/4 inch) on a Printrbot part. This method is very limited, but it's free and straightforward. I've also included an STL file of a soda can that can be used as an alternative size reference. You might prefer to use this easy and free program for taking dimensions of STL files: http://www.netfabb.com/basic.php