Small box with a sliding, shutter style lid.
Print the cases A and B upright, so that the flat sides of the box are
on the platform. For the lid, print flat with the ridges facing up.
Curl the lid around a pencil or something similar to bend it to the
right shape. Put Case A and B together to see where they connect.
Slot the lid into Case A and slide it to the fully open position.
Add glue to the connecting areas of Case A and press Case B
firmly in place. While holding the parts together slide the lid open
and closed a couple of times to make sure no glue sticks to the lid.
Recommend to be printed in ABS as PLA may not be flexible
enough for the lid. Will probably not last forever as the lid may crack after considerable use.