Flying Bear Ghost 5 printer has a slot for the flash card with a wide unneeded slot at the bottom, through which, if not hit, the flash card often falls inside. To obtain it back you will have to remove the bottom panel, which is extremely inconvenient.
This overlay prevents such an incident by effectively turning the input slot into a mini-receiver, like an ATM. And now you can put your flash card in even with closed eyes.
I printed it with ABS+ but it could be printed with any filament because the temperature at the place is not high.
Here is a Flash Card sample. You can download the Flash Card Overlay out from here: