Concentric Ring Fit Test

This is a very tight tolerance concentric ring fit and calibration test. It was designed around PLA but should be applicable to any material. It is assumed that the printer on which the test is run can hold a tolerance of 0.1 mm. It is highly recommended that the basic filament calibration test found here http://www.thingiverse.com/thing:1037301 be run before you try this one.

This calibration and fit test consists of three rings that match up and fit inside each other to test different pa