Odroid HC4 Case HDD 3.5" + 2.5"

ODROID HC4 NAS CASE

Updates:
Added 2.5" HDD support.
Added 120mm fan version.

About This Design

If you're looking for an alternative case for your Odroid HC4 that fits 3.5" HDDs and 2.5" HDDs, you've come to the right place. Many of the designs I found either weren't to my taste or lacked proper disk support. This model was designed to be practical and living room friendly. 

This case was designed from scratch and, in the strictest sense, is not a remix. However, it was heavily inspired by this design, borrowing some of its successful solutions.

I designed this case with my own usage in mind, as my need to access the HDDs is very infrequent (annually and less). My design choices, therefore, do not cater to the needs of an extremely high-frequency use case.

I intentionally made the grill a simple press-fit, but now its relying on gravity to hold it in place. While this might seem unconventional, I chose this method to reduce the risk of damaging the print during HDD changes.

Just keep this in mind if you plan to take your NAS case on a rollercoaster ride—while the HDDs will stay secure, the grill will not.

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Assembly & Components

The mounting holes (2.4mm diameter) are designed to hold M3 screws (3mm diameter).

What you alredy have:

• Odroid HC4 board

• 8 original screws from the Odroid HC4 Case

What you additionally need:

• 4 screws similar to those from the original case

• 5V PWM 92mm fan or 120mm fan (supported until 30mm height)*

• 4 screws (M3) designed for plastic to mount the fan, length dependent on the fan model you us

• 8 HDD screws (accounting two mounts)

*A 12V PWM fan can also be used, but it's only compatible by connecting to test points TP11 (for 12V) and TP2 (for GND). If you need to buy a fan, a 5V model is highly recommended since it's naturally supported by the board.

Important: Mount the fan to the bottom part before assembling the rest of the unit.

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General Printing Instructions

• Nozzle: 0.4mm nozzel recommended

• Perimeters: For all parts its recommended to use 3 or 4 perimters to eliminate the need for infill. This is mandatory for the HDD Bracket to prevent the snap-latch from breaking.

• Supports: Minimal support is needed for the joints on most parts. Organic supports are highly recommended for this application. 

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Part-Specific Print Instructions
 

00_HDD Casing (top)

• Print upside down 

• minimal support on the locker of the HDD bracket snap-latch

01_Main Casing (mid)

• organic support for the top joints recommended 

• If youre not comfortable with bridging, add support for the interface cutouts.

02_Fan Casing (bot)

• organic support for the top joints recommended

03_HDD Bracket (two times)

• No support is needed. 

• Print with at least 3 perimter walls.

04_Grill - Do not print as is! its modeled solid but its not in application!

This is the most challenging part to print. The model is solid, but you will use infill to create the final grill effect. 

• Orientation: Print with slopes on top.

• Layers: Delete horizontal solid layers (top and bottom)

• Infill: “Grid” infill (Prusa) recommended, choose density that is aesthetically pleasing (10 - 30%).

• Fill Angle: 0° (grid is parallel to the outer structure, not 45°)

• Infill Anchors: Set “no open anchors” and a maximum length of “0mm” (basically no anchors)

• Infill Speed: 50%, but no need to go lower than 20mm/s. 

Most tricky part: It was designed to be press fit, but still easy enough to remove annually for HDD change. In the end i did the most blaspehmous thing imaginable: relying on gravity. Knowing i could add some knobs which would result in some snap in place features, this would also make it harder to detach and increases the risk to damage the grill. So i kept it easily removable.

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Future Updates

This design may be updated in the future to include support for different fan sizes.
Just leave a comment and i change the parameter.