# Easy Removable Mods for the Casio F-91W Source: https://www.youtube.com/watch?v=3EXhNO55sGg Recap page: https://rapidrecap.app/video/3EXhNO55sGg Generated: 2025-10-30T21:02:44.135+00:00 --- ## Quick Overview The video demonstrates how to easily change the watch face appearance of the Casio F-91W digital watch by inserting thin, colored plastic filters between the original screen cover and the LCD, using a magnetic micro SD adapter for the backplate to maintain water resistance without permanently altering the watch case. **Key Points:** - The creator demonstrates changing the Casio F-91W watch face color by inserting thin plastic filters (0.3mm thick) between the screen cover and the LCD. - Lighter color tints allow for better readability on the LCD compared to darker filters, which obscure the display. - The video features a collection of custom screen covers/bezels with various colors (e.g., blue, yellow, pink, orange) and textures (stippled, smooth). - A custom magnetic backplate adapter is shown, designed to hold a Micro SD card while magnetically attaching to the watch's rear bulge, preserving water resistance. - The magnetic adapter uses four 8x1mm thick magnets to securely attach to the backplate without needing to unscrew or compromise the watch's water seal. - The creator mentions moving away from inverted LCD mods and will focus on color filter mods for the future, offering the design files as open source on Node website. ![Screenshot at 0:20: A hand holding a small, clear, rectangular piece of plastic, representing the filter/screen protector material, to be used for customizing the watch face color.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-00-20.png) **Context:** The video focuses on customizing the aesthetic appearance of the classic, inexpensive Casio F-91W digital watch. The creator showcases two primary modification techniques: first, applying colored films/filters over the LCD to change the display color, and second, demonstrating a 3D-printed magnetic adapter for the case back that allows for carrying a Micro SD card while preserving the watch's original water resistance features. ## Detailed Analysis The video details how to customize the Casio F-91W watch face without requiring tools or permanent modification, focusing on screen covers and color filters. The creator first shows how easy it is to apply screen covers, noting that the angular, symmetrical grooves on the watch body are ideal for custom designs that snap on. The main method involves using thin, colored plastic sheeting, similar to those used for photography gels, with a thickness of 0.3mm (dimensions 24x18mm). The creator warns that darker colors significantly reduce LCD readability, favoring lighter tints for visibility. A variety of custom bezels/covers with different colors and textures are displayed. Furthermore, the creator introduces a secondary modification: a magnetic Micro SD card addon that fits onto the round bulge on the back of the watch case. This addon uses four 8x1mm magnets to securely attach without removing the case back, thereby retaining the watch's water resistance, which is a key advantage over traditional battery replacement methods that require unscrewing the backplate. The creator concludes by stating they will stop pursuing inverted LCD mods and will focus on these color filter designs, making the files for both the screen covers and the magnetic SD addon available as open source on the N-O-D-E.shop website. ### Watch Face Customization - Changing the F-91W face color by inserting thin 0.3mm plastic color filters between the screen cover and LCD - Lighter tints maintain better LCD readability than darker ones - A range of custom covers with various colors and textures are shown. ### Magnetic Micro SD Adapter - An updated magnetic addon design holds a Micro SD card using four 8x1mm magnets that attach to the watch's rear bulge - This method maintains the watch's water resistance, unlike modifications requiring removal of the case back. ### Design Files and Future Plans - All files for the screen covers and the magnetic SD adapter are released as open source on N-O-D-E.shop - The creator is concluding work on inverted LCD mods to focus on these color filter designs. ![Screenshot at 0:03: Wireframe illustration of the Casio F-91W watch surrounded by outlines of snap-on protective covers.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-00-03.png) ![Screenshot at 0:14: A hand holding the Casio F-91W watch horizontally against a white background, displaying the standard LCD.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-00-14.png) ![Screenshot at 0:21: A hand uses tweezers to hold a thin, clear plastic sheet, representing the material used for color filters.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-00-21.png) ![Screenshot at 0:35: Hands demonstrating the watch with a black, textured screen cover/bezel installed, showing an orange LCD tint.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-00-35.png) ![Screenshot at 0:47: The Casio F-91W worn on a hairy wrist, displaying the standard LCD with a blue frame.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-00-47.png) ![Screenshot at 1:01: A collection of colored, translucent plastic sheets \(yellow, green, blue, orange\) used for testing LCD color filters.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-01-01.png) ![Screenshot at 1:20: A pile of various 3D-printed custom screen covers/bezels in different colors \(black, white, yellow, olive\) and textures, some with colored lenses.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-01-20.png) ![Screenshot at 2:05: A hand holding the round magnetic Micro SD adapter, showing the recess for the SD card held by two magnetic pads.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-02-05.png) ![Screenshot at 2:34: A schematic diagram illustrating the dimensions of the magnets used in the backplate addon \(4 x 8 x 1mm\).](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-02-34.png) ![Screenshot at 2:53: The variety of custom screen covers/bezels displayed on a white surface, highlighting the different colors and finishes available.](https://ss.rapidrecap.app/screens/3EXhNO55sGg/00-02-53.png)