Custom 3D-Printed Micro SD Card Holder for Casio F91W Watch

This upgraded Micro SD card holder is a fully standalone add-on designed specifically for the Casio F91W. It allows you to easily carry a backup micro SD card with you at all times — perfect for storing photos, documents, music, or any other important files.

Key Features & Updates:

• Completely standalone design: The Micro SD socket is now fully independent from the backplate, making installation cleaner and more reliable.
• Easy attachment: Secures to the watch using the included 4 × M1.4 × 6mm screws.
• Smart low-profile fit: The center section of the 3D-printed frame is intentionally thin and flexes gently over the watch internals, providing just enough clearance for the Micro SD socket while maintaining a compact, comfortable fit.
• High-capacity ready: With modern micro SD cards now offering storage capacities in the terabytes, this accessory turns your F91W into a discreet, always-on data backup solution.

Important Installation Note: When attaching the holder, gently bend the watch’s piezo contacts (the metal tabs responsible for the beeping sound) upward so they make proper contact with the inside of the metal backplate. This ensures the alarm and button sounds continue to function normally.

What’s Included:

• 3D-printed Micro SD card holder (socket pre-installed)
• 4 × M1.4 × 6mm screws

Please note: The Casio F91W watch is not included.

This is a great functional mod for anyone who loves their F91W and wants added utility without sacrificing the watch’s classic slim profile. Printed with high-quality filament for durability and a precise fit.

Feel free to message me with any questions before purchasing!