Hollow 3D Printed Die

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I played with some 3D printed dice and after testing I discovered that square corners, not round or truncated corners, and low, nearly hollow infill, make the most balanced 3D printed dice. So I made this, a FFFriendly 3D printed dice that is hollow and prints without support (provided you have reasonable bridging ability). The square one scored a chi-squared of 14 after 30 rolls, the truncated one scored a 30, meaning the square corners is among the most fair 3D printed hollow dice I've tried. 

See http://joesmakerbot.blogspot.com/2013/10/testing-3d-printed-dice-fairness-chi.html for more information.