Printer Tolerance Calibrator

Please note: I haven't been able to test this in real life yet, so it might not work at all. Comments are appreciated!

This calibrator enables you to easily measure the tolerance required to create separate fitting parts.

Instructions
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1. Make sure your extruder and stepper motors are calibrated, your bed is level and you have a working setup. This calibrator is for final fine-tuning pre-production, not for initial calibration.
2. Slice and print both parts with the same filament and settings that you'll print your parts with.
3. Remove anything that you would remove from any other printed part (blobs, stringing, whatever) to make sure the surfaces where both parts touch each other are clean and even.
4. Insert the top part in the bottom part in the direction of the arrows until you feel resistance.

Interpret your results
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1. If both notches line up with 0, you don't need to add tolerance to create fitting parts.
2. If the Ov