OMT² - Hex Precision Tests for Bit Holders

Creating tools that are meant to fit standard bit holders requires a very high precision.
To help you figuring out how precise is your printer (or your settings), or which flavour of that OMT² bit you like so much to take ...here are a few tests for you.

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This is just a print test. To know more about the project, visit : http://www.thingiverse.com/thing:1381028

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*** Tight (No tolerance) ***

> This test is exactly 1/4" (or 6.35mm).
> Depending on your printer's precision