With the want to create a more professional NAS solution than the one in my apprenticeship (just a raspberry pi with two external USB 1TB HDDs lying on the floor), I wanted to create something cheap, but still good and with good capacity.
Since ready made NAS Enclosures would work, but are really expensive, I decided to Design my own in Fusion 360.
After finishing the model and printing it, I filled it with 4 2TB HDDs, which I configured in Raid 10.
In the back I placed the Raspberry Pi 4 and connected a daughterboard to control the Fans, as well as connecting the external ethernet port to enable a fast wired connection to outside the case. I also added a status LED, as well as a simple push button in order to have a “soft shutdown” button, which initiates a software shutdown. You can also just cut power with the power switch, but the soft shutdown is safer.
Here are real-life pictures of the hardware: