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4 Point Bend Specimen

Yes, this is a 3D model of a rectangle.

I am writing a blog series about designing a low cost yet very capable homemade testing machine and using it to analyze the mechanical properties of 3D printed materials.
This rectangle is actually a test specimen specifically designed for a 4 point bend loading on my machine. 
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You can follow along with the project at the link below, any feedback or fresh ideas will be greatly appreciated! What mechanical properties would you test 

 http://engineerdog.com/2015/03/24/introduction-to-3d-printing-materials-testing-series/

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