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If you want to get the hex grid you must slice it on slic3r with this settings:
layer height: 0.2mm
Solid layers: top: 0 bottom: 1 (or 2)
Infill:
Fill density: 0.3
Fill pattern: honeycomb
Fill angle: 45º
If you slice it on Cura you'll get an square grid:
Bottom/Top thickness (mm): 0.2 (or 0.4)
Fill density (%): 30
...Infill:
Disable "Solid infill top"
Enable "Solid infill bottom"
Infill overlap (%) 15
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