Gridfinity base frame for 400x300mm Euro boxes. 
356x252mm of clearance is required at the bottom of the box. 

You can stack multiple layers by screwing 2 grids and 2 handles to a thin board (cut to 356x252mm).
Predrill holes with the drilling jig.
 
With multiple layers of gridfinity that are easily removable you can get highly dense storage that is still convenient. Fits 48 Gridfinity units per layer

178x252mm print area required.

Gridfinity in a Eurobox

Base Grid_x2.3mf

More sizes of devider bins!
Made the nameplate smaller and reduced the corner radius too. For more storage capacity.

The Magnet holes are removed to make it easier to print and prettier.

A somewhat working Fusion file is attached as well.
2x2x6 
2x3x6
3x2x6
3x3x6
4x2x6
4x3x6
5x2x6

Gridfinity more sizes with adjusted radius and smaller nameplate

Divider Box 3x2x6 1-Compartment.stl

Gridfinity Compact Endmill Storage with Tool numbers.
Aimed at effectively storing Endmills for CNC machining. Numbered so you can have uniform tool library.
Up to 12mm diameter.
Can fit 3 6mm tools in a single slot.
Printed 1 perimeter and 12% infill. About 400g of filament.

The Magnet holes are removed to make it easier to print and prettier.

Gridfinity Compact Endmill Storage with Tool numbers

Endmill storage 00-69.stl

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Gridfinity in a Eurobox

Gridfinity more sizes with adjusted radius and smaller nameplate

Gridfinity Compact Endmill Storage with Tool numbers