6" x 16" Two Cavity Cinder Block
thingiverse
This is a standard 5.625 inches by 5.625 inches by 15.625 inches CMU (Concrete Masonry Unit). I modeled it at actual size, so you'll need to scale down when printing, or you'll end up with an enormous print. It was designed based on the specifications shown in a PDF from specblockusa.com: http://specblockusa.com/downloads/gray-block/size-shape-2013.pdf The actual measured dimensions are 5.625 inches x 5.625 inches x 15.625 inches, which is the actual size of a concrete CMU (0.375 inches is left out for mortar). The FreeCAD file for this model is here: https://github.com/rl337/freecad/blob/master/construction/6x16TwoCavityCinderBlock.FCStd
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