Puzzle trays you can stack two ways. For storage they go on top of each other like any plate. But for puzzle making I prefer to stack them at an angle to each other so I can see what each contains with one glance. With the lip cut they don't slide around no matter which way you stack them. 

Shallow tray has stacked inside height of 12mm and taller version has 22mm. Total print height for shallow tray is 19.5mm and for tall 29.5mm. Other dimensions are 185x185mm. 

In the picture you see both version 1 and 2. Version 1 doesn't have lip cut for stacking at an angle. Files provided are only for version 2. I recommend using neutral coloured filaments. The pink ones I have printed proved a bit too colourful for easy viewing of the pieces on the tray.