These are some skadis containers in different lengths. One container is one solid part. Neither do they require any separate hooks nor supports while printing. 

They are compatible with my Modular Skadis Container System (S), a smaller version with the same design (2nd Picture). 

Use cases

I use the containers to keep my dice sorted, but in the end you could use them for whatever you like. 

The walls are 2,5 mm thick, so the usable length inside would be the outer length (40 mm, 60 mm, 80 mm, 100 mm or 120 mm) minus 5 mm. The inner height of all of these boxes is 55 mm and their maximum depth is 35 mm. 

Nomenclature 

The first number represents the width of the box in millimetres. 40 mm is one full unit, after that the hook pattern repeats itself. 

The second number indicates wether the hooks are placed high or low (back view, left to right).

Printing

You don't need any supports or extra hooks for this print. They are supposed to be printed in the orientation thy are uploaded. Depending on how well your filament sticks to your plate, you might want to add a brim for extra stability. 

Inspiration 

Shape and print orientation are inspired by SMACKMAX' Skadis Pockets / Bins / Tool holder. You should definitely consider printing those as well.