Tight Tolerance Test (Parametric)

I created this project to help measure clearance for a tight, but freely moving fit between a printed part and a through hole cutout.  This test is not meant to calibrate dimensions for a single part, but instead to understand how multiple printed parts will work as part of an assembly.  For friction-less motion without binding you need a certain tolerance that creates a small gap between parts.  

The square is 18 mm x 18 mm x 4 mm.  Take care to edit layer heights in your slicer so that you can get 4 mm exactly without rounding to the nearest layer. The smallest and largest tolerance values are labeled on the front, with the step size on the back.  The wall thickness in the test is designed for 3 perimeters of a 0.4 nozzle with a small amount of infill.  

I modeled files with 0.04 mm and 0.02 mm step sizes sweeping across several ranges of values.  Feel free to edit the variables (and update the text labels!) in the f3d file if you want a custom test.

Thanks for visiting, and enjoy!

Major update: The cutouts now go from smallest to largest in one straight line, making identification simpler.  I removed the X and Y text label on the test square.  This gives the part a smoother finish and more consistent readings at tight tolerances.  I also added step files.