Stackable storage boxes, box-in-box (small, medium, large)

Stackable storage boxes with honeycomb profile to save material.

Note that I created 2 different series, which vary in how they much they stack on top of each other and if smallers sized boxes can fit in a larger box. Below you find the differences and the links to the right series.

__First series: *this model represents this series* - Stackable boxes, box-in-box (small, medium & large)__ :
* Stackable: yes, but only boxes that are the same size (see pictures)
* Box in box: yes, 2 small boxes fit into one medium box, 2 medium boxes fit into one large box (see pictures)

__Second series: Fully stackable boxes (small, medium & large)__ :
* Stackable: yes
* Box in box: no
* Link: https://www.thingiverse.com/thing:6800499

Included in this model are 3 sizes of storage boxes:
- __Large__: 250 mm length x 250 mm width x 129 mm height, 2.5 mm wall thickness and 325 grams filament usage
- __Medium__: 239 mm length x 119 mm width x 122 mm mm height, 2 mm wall thickness and 1