🛠 Introduction The stock fan controller PCB in the Rosewill ACA502B is left completely exposed inside the case. Besides looking unfinished, it leaves the board vulnerable to contact with surrounding cables and makes it difficult to remember which connector goes where during installation or future maintenance.

To solve these issues, I designed a precision-fit enclosure that completely surrounds the fan controller PCB while adding clearly labeled port names on the front of the enclosure. The result is a cleaner, more professional-looking installation that protects the controller from accidental contact with nearby wiring, helps reduce the possibility of electrostatic discharge (ESD) from exposed components, and makes reconnecting fans quick and intuitive.

The enclosure has been carefully modeled to match the dimensions of the original PCB, ensuring a snug, secure fit without interfering with the case or side panel.

📦 What's Included

This model consists of three files:

enclosure_front

enclosure_front_text (for multi-color printing with an AMS)

enclosure_back

The front and back pieces feature a precision peg-and-hole snap fit for easy assembly. Once assembled, the enclosure is mounted to the case using the original mounting locations, where two screws permanently secure everything together for a solid, worry-free installation.

Unlike the factory enclosure, which uses two M3 × 5 mm screws, this design requires two M3 × 20 mm screws using the same original mounting holes.

✨ Features

Designed specifically for the Rosewill ACA502B fan controller PCB.

Precision-fit enclosure modeled directly from the PCB dimensions.

Clearly labeled front ports for quick and accurate cable installation.

Protects the exposed PCB from accidental contact with surrounding wires.

Helps reduce the risk of ESD caused by exposed electronics.

Gives the interior of the case a cleaner, more professional appearance.

Precision snap-fit design combined with screw mounting for maximum security.

Does not interfere with installation or removal of the case side panel.

🖨 Print Settings

Recommended Material

PETG (recommended)

PLA

Print Settings

Layer Height: 0.20 mm

Infill: 10–15%

Supports: Not Required

Multi-Color Printing (AMS) If you would like the lettering to print in a different color, simply print the file marked "enclosure_front_text.3mf" using your AMS or multi-material printer.

If you're printing in a single color, use enclosure_front instead.

🔧 Assembly Instructions

Print enclosure_back and either enclosure_front or enclosure_front_text.

Place the fan controller PCB into the enclosure.

Align the front and back halves and press them together until the peg-and-hole snap features fully engage.

Install the completed enclosure into the original mounting location inside the Rosewill ACA502B.

Secure the enclosure using two M3 × 20 mm screws.

The snap-fit keeps the enclosure aligned during assembly, while the mounting screws permanently secure it to the case, ensuring it remains firmly in place.

🛠 Removal

If you ever need to remove the PCB from the enclosure, use a pair of needle-nose pliers. Carefully insert the tips near one side of the enclosure and gently spread the pliers outward to release the snap tabs. Repeat for the opposite side until the enclosure separates without placing unnecessary stress on the PCB.

🤝 Collaboration & License

I enjoy creating practical upgrades that improve both the functionality and appearance of existing hardware. If this enclosure helped your build, I'd love to see your completed project or hear your feedback. Suggestions and improvements are always appreciated.

You're welcome to share, remix, and modify this design for your own personal projects.

License ✅ Sharing is encouraged.

✅ Modifications and remixes are welcome.

✅ Attribution is required.

❌ Non-Commercial.

If you publish a modified version, please credit the original author and include a link to the original author's page so others can find the original design and future updates. This helps ensure improvements remain connected to the original project and benefits the entire community.

Thank you for respecting the work that went into this design, and happy printing!