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A parametric Modell of the standard Gridfinity Box in Solid Edge.

If you set a Dimension to 1, the Model gets stuck. 
So if you want a 1x4 Box, Set 4 first and 1 afterwoods. 

The rounded cornor on top is not official, but I think its better. Simply delete it, if you want original version.

Breite (red) and Tiefe (green) are the Variables for X and Y Dimensions, Höhe (blue) means hight.

I've added a few STL boxes I've in use