This is a case for a raspberry pi 4 in use with a 2.5" SSD Drive.
SSD drive slips into the slot at bottom. lid has hole for mounting a small 5v fan.
lid attaches to case with 3 self tapping screws.
i use clear packing tape across bottom of the case if the ssd drive is a bit too loose in it's sleeve. Different ssd drives have slightly different dimensions I have found.
The case would also work with a pi 3 however the lid would need to be modified to fit the different usb and ethernet port configuration of the 3.

If you print the box in a vertical orientation, support structures are needed.
I added a 2nd thicker version box (one with the w on the end) which has a bit thicker sleeve for the drive. As i said different 2.5" dricves have slightly different dimensions.