The original clear toaster design of the Odroid HC4 is horrible. This aims to be a much better option. While there are some HC4 cases available. I could not find any good ones that can accept 3.5 inch enterprise class HDDs.

This case should have better airflow, and help prevent dust from settling on your HDDs.

Note that this version does not have a window for the IR sensor, or have a space for the OLED display, as I don't have one. If someone want's to ship me a display, I'll upload a version of the body that has a space for it.

The enclosure is made up of the following parts:

-Base
-Main Body
----Bottom
----Middle Band
----Top
-Inner Lid
-Outer Cosmetic Lid
-Lid Spacer - (4 pieces required)
-HDD Support 3.5 Inch

I printed the main body using multi-material. If you print the main body as a single print. No supports are required. I have not tried, but it should be possible to print the main body in 3 pieces and glue them together (there is zero clearance, so you might need outer wall offsets). This will require supports. If you want the case to be a single color, I have included NAS Case - Single Color Body and NAS Case - Single Color Lid that reduces the part count. Print these two instead of the three body files, and the outer cosmetic lid + four lid supports.

Assembly uses the 8 screws that come with the Odroid. 4 hold the PCB to the base. 4 hold the Outer Cosmetic lid and Inner Lid together.
Optionally, I have included a part that can be printed in clear to serve as a light pipe for the LEDs. I left this hole unpopulated in mine, which works just fine too.

I only have included a HDD Support bracket for 3.5 inch drives, as this is what I use. I expect this should work just fine for all standard 3.5 inch drives. If you use 2.5 Inch drives, it should be fairly simple for you to model an updated support bracket.

Lastly, and optionally, you can glue the Base to the Main Body if you would like. As well as use rubber or felt feet. This is likely required if your printer is prone to warped parts.

I recommend all parts be a material other than PLA for the heat resistance. ABS (white) and carbon fiber ABS (black) shown in the image. I like CF ABS for wide flat parts for the dimensional accuracy and low warp.