There are three sizes of inside parts empty, half and full.
Print settings.
If you use a 0.25mm nozzle you will get even smaller hexagons.
And for better print I would recommend to set the only retract when crossing perimeters setting to FALSE (in PrusaSlicer), Print Settings/Infill/Only retract when crossing perimeters.
NOTE: you might need glue.
The author marked this model as their own original creation.