NAS-System for a Raspberry Pi 3 B.
Space for two HDDs, a Raspberry Pi, a USB-Hub for powering the two HDDs and a small fan (40mm x 11/12mm).
The hub is necessary, as the Raspberry isn't capable of powering two HDDs at the same time. (I used this one: https://amzn.eu/d/4lAUldJ)
You have to glue the fan-cover in place and you need six magnets (8 x 3mm). For me it wasn't necessary to print small caps for the mounting pins for the Raspberry, they hold it in place securely. Additionally some magnets may need glue also, others don't.
The fan slides in the two rails (it has rubber on its edges), which clamp him down.
You can mount the NASPi on a wall (2 mounting holes in the back) or you can use the stand for it.
Sometimes the lid warps a bit after cooling down, you can use a hairdryer and bend it so it is straight.
The author marked this model as their own original creation.