Ahoy-hoy, wonderful people!
Sometimes you just can't keep your Raspberry Pi cool! But never fear, this variation on the clamshell RPi cases is built around incorporating a large fan for extra coolness!
It's also a much larger case with an abundance of space inside, so it's also relevant for projects that need that kind of volume. In fact, a circular grille on the side in early versions of this was discarded in favour of this vertical line style so that it wouldn't look odd if the fan was omitted.

Optional Fan
This case is designed to hold a 60mm x 15mm fan, which will just slot in along the side of the case. A cable routing gap is provided to allow convenient wiring either to the Raspberry Pi board itself, or out to an external source if you're running a fan that takes that much power. In fact, the access port for the Micro SD card has been enlarged substantially to allow for that or any other kind of cable routing.
As with the other clamshell cases, this one uses a lock ring to secure it, and no other hardware is required.
Print Description
This is an articulated print, so make sure your first layer is nice and neat and that there aren't any print issues like stringing or overextrusion that might cause moving parts to bind together!
Print Dimensions
These cases occupy 191mm x 86mm on the print bed, and are 73mm tall.
Supports Needed?
Not at all! Designed for straightforward printing!
Scalability
Well, it's built to precisely hold a Raspberry Pi board, so you probably shouldn't scale it.
Print Orientation
The case prints folded open with the top and bottom against the print bed.

File Location
You'll find this one at at 516 Fan Block RPi 3-4-5 Cases
Link to dropbox post: https://www.patreon.com/posts/31697592
Further Thoughts
These cases also include the attachment points in the base that are used in the other clamshell cases, so you can use the same feet and other components should you be so inclined!
Happy printing!
xoxo
Sven.