Stackable Small Parts Tray (Customizable)

An stackable customizeable tray for small parts.

While it is technically not a remix it was heavily inspired by
https://www.thingiverse.com/thing:3263783
and
https://www.thingiverse.com/thing:2562937

I wanted to have boxes that are:
- appropriate for very small (or flat) parts
- stackable
- small enough to print 4 pieces on a 21 cm x 21 cm build plate
- big enough to hold a raspberry pi and 3.5 inch square notes
- and can be used upside down as lids