Summary

I thickened the outer wall of the original design, increased the number of storage, boxes can be stacked and assembled, and added another higher box type.

The idea came from :
https://www.thingiverse.com/thing:1975865
https://www.thingiverse.com/thing:5021804

2021/11/18 updated drawer STL files.
fix issue:
the bit holders don't print properly, some of the wavy lines don't print.

2021/11/20 Add a new drawer, which is empty, with no partition.