Self designed light box for the filament sample card available here: https://makerworld.com/en/models/36331#profileId-34294
Fusion 360 File provided for you to make adjustments as you require. A 12.5mm and 3.6mm hole is for a switch and USB cable. Magent is a 4mmx2mm, same as used in the filament sample cards.
A 0.2mm diffusion plate and general lid is also provided if required.