I wanted a SD card holder for my Ender 3 V2 Neo where my MicroMax SD card grip equipped memory cards will fit in so i modified the existing box for my needs with Tinkercad.
It takes three cards with grips ant two regular ones.
There is a version with mounting holes that can be installed in the printer's slots using M3 t-nuts and M3 x 8 mm screws and one without holes to be just standing around or being glued to a flat surface. I also added an opening on the bottom for dust and dirt to fall out and to rescue grip-less cards that were accidentally pushed into the 3 deeper slots, so i recommend to print the "open" versions. ;)
https://www.printables.com/de/model/77594-micromax-sd-card-grip
https://www.printables.com/de/model/203578-drop-in-t-nut-2020-2040-extrusion-m3-nut-insertion
The author remixed this model.
left out the cover and added deeper slots