I'm using a self-made 3D-printed cover for the USB power supply unit for the WonderSwan Color and Crystal. (This is a set of the power supply board and cover) The conventional Chinese-made power supply boards had tall components and bulged out like a regular battery case, but around the end of 2024, a new type of power supply board appeared with lower component heights, allowing for the attachment of a flat cover. I tried to print it as cleanly as possible, but it's a layered print, so it has a slightly jagged feel, but please understand that this is the nature of the process. The LED is visible through the translucent cover, and the seams of the print are slightly visible, but this is the current product specification. (See photos) Opaque colors like black and red will make the LED almost invisible. (Black is practically invisible) Power is supplied via a USB-C connector, and any standard 5V output is OK. (USB-PD is not supported) The power supply unit and board cover are the only items included. The board cover is made of PLA resin and is sensitive to high temperatures. Do not leave it in a place that exceeds 40 degrees Celsius, as it may deform. Other colors will depend on the availability of affordable filament, so please request them in the comments, and I will check if it's possible. For those who already have a power supply board: If you only want the cover, please ask in the comments. However, due to individual differences in the soldering of the board, the metal fittings may be raised, and it may not be possible to attach the cover as is, so this is for those who can modify it by trimming, etc. Currently, it's Ver.0.47, and I'm periodically reviewing the shape.