Full description & instructions are available on Thingiverse -
https://www.thingiverse.com/thing:5001271
Note - The online customizer hasn't worked for a while now, there are instructions below for OpenSCAD (it's just as easy, much quicker and free).
Circle_Box.stl | 234.3KB | |
Circle_Lid.stl | 280.0KB | |
Customizable_Box_V01.scad | 55.9KB | |
Heart_Box.stl | 181.9KB | |
Heart_Lid.stl | 300.7KB | |
Heart_Lid_V2.stl | 172.7KB | |
Hex_Box.stl | 254.6KB | |
Hex_Lid.stl | 450.5KB |