Gridfinity parametric FreeCAD file along with Blank Storage 3x2x3 .stl file

Zack Freedman's Gridfinity 'Blank Frame' and 'Blank Storage' re-implemented in FreeCAD.

The FreeCAD file contains an object 'dd' (DynamicData), where the parameters may be set in the section 'User Settings' of the property editor (Columns, Rows, Height, Set_screw_holes). This is a complete rebuild compared to what I uploaded on 2022-06-16, several bugs of the old version fixed.

One exported .stl file is enclosed as an example: Gridfinity blank storage bin, 3x2 units wide/long, 3 units high, no screw holes in the magnet pockets in the base.

2023-02-26 Added variable height infill.